759 lines
24 KiB
JavaScript
759 lines
24 KiB
JavaScript
/** @license React v0.9.0
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* react-refresh-babel.development.js
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*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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'use strict';
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if (process.env.NODE_ENV !== "production") {
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(function() {
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'use strict';
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function ReactFreshBabelPlugin (babel) {
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var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
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if (typeof babel.env === 'function') {
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// Only available in Babel 7.
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var env = babel.env();
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if (env !== 'development' && !opts.skipEnvCheck) {
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throw new Error('React Refresh Babel transform should only be enabled in development environment. ' + 'Instead, the environment is: "' + env + '". If you want to override this check, pass {skipEnvCheck: true} as plugin options.');
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}
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}
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var t = babel.types;
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var refreshReg = t.identifier(opts.refreshReg || '$RefreshReg$');
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var refreshSig = t.identifier(opts.refreshSig || '$RefreshSig$');
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var registrationsByProgramPath = new Map();
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function createRegistration(programPath, persistentID) {
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var handle = programPath.scope.generateUidIdentifier('c');
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if (!registrationsByProgramPath.has(programPath)) {
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registrationsByProgramPath.set(programPath, []);
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}
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var registrations = registrationsByProgramPath.get(programPath);
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registrations.push({
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handle: handle,
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persistentID: persistentID
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});
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return handle;
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}
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function isComponentishName(name) {
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return typeof name === 'string' && name[0] >= 'A' && name[0] <= 'Z';
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}
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function findInnerComponents(inferredName, path, callback) {
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var node = path.node;
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switch (node.type) {
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case 'Identifier':
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{
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if (!isComponentishName(node.name)) {
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return false;
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} // export default hoc(Foo)
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// const X = hoc(Foo)
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callback(inferredName, node, null);
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return true;
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}
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case 'FunctionDeclaration':
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{
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// function Foo() {}
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// export function Foo() {}
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// export default function Foo() {}
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callback(inferredName, node.id, null);
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return true;
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}
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case 'ArrowFunctionExpression':
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{
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if (node.body.type === 'ArrowFunctionExpression') {
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return false;
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} // let Foo = () => {}
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// export default hoc1(hoc2(() => {}))
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callback(inferredName, node, path);
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return true;
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}
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case 'FunctionExpression':
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{
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// let Foo = function() {}
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// const Foo = hoc1(forwardRef(function renderFoo() {}))
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// export default memo(function() {})
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callback(inferredName, node, path);
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return true;
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}
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case 'CallExpression':
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{
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var argsPath = path.get('arguments');
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if (argsPath === undefined || argsPath.length === 0) {
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return false;
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}
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var calleePath = path.get('callee');
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switch (calleePath.node.type) {
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case 'MemberExpression':
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case 'Identifier':
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{
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var calleeSource = calleePath.getSource();
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var firstArgPath = argsPath[0];
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var innerName = inferredName + '$' + calleeSource;
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var foundInside = findInnerComponents(innerName, firstArgPath, callback);
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if (!foundInside) {
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return false;
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} // const Foo = hoc1(hoc2(() => {}))
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// export default memo(React.forwardRef(function() {}))
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callback(inferredName, node, path);
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return true;
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}
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default:
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{
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return false;
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}
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}
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}
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case 'VariableDeclarator':
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{
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var init = node.init;
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if (init === null) {
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return false;
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}
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var name = node.id.name;
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if (!isComponentishName(name)) {
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return false;
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}
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switch (init.type) {
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case 'ArrowFunctionExpression':
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case 'FunctionExpression':
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// Likely component definitions.
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break;
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case 'CallExpression':
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{
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// Maybe a HOC.
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// Try to determine if this is some form of import.
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var callee = init.callee;
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var calleeType = callee.type;
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if (calleeType === 'Import') {
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return false;
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} else if (calleeType === 'Identifier') {
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if (callee.name.indexOf('require') === 0) {
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return false;
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} else if (callee.name.indexOf('import') === 0) {
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return false;
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} // Neither require nor import. Might be a HOC.
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// Pass through.
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}
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break;
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}
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case 'TaggedTemplateExpression':
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// Maybe something like styled.div`...`
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break;
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default:
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return false;
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}
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var initPath = path.get('init');
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var _foundInside = findInnerComponents(inferredName, initPath, callback);
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if (_foundInside) {
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return true;
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} // See if this identifier is used in JSX. Then it's a component.
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var binding = path.scope.getBinding(name);
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if (binding === undefined) {
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return;
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}
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var isLikelyUsedAsType = false;
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var referencePaths = binding.referencePaths;
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for (var i = 0; i < referencePaths.length; i++) {
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var ref = referencePaths[i];
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if (ref.node && ref.node.type !== 'JSXIdentifier' && ref.node.type !== 'Identifier') {
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continue;
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}
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var refParent = ref.parent;
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if (refParent.type === 'JSXOpeningElement') {
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isLikelyUsedAsType = true;
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} else if (refParent.type === 'CallExpression') {
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var _callee = refParent.callee;
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var fnName = void 0;
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switch (_callee.type) {
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case 'Identifier':
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fnName = _callee.name;
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break;
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case 'MemberExpression':
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fnName = _callee.property.name;
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break;
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}
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switch (fnName) {
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case 'createElement':
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case 'jsx':
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case 'jsxDEV':
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case 'jsxs':
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isLikelyUsedAsType = true;
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break;
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}
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}
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if (isLikelyUsedAsType) {
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// const X = ... + later <X />
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callback(inferredName, init, initPath);
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return true;
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}
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}
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}
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}
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return false;
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}
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function isBuiltinHook(hookName) {
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switch (hookName) {
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case 'useState':
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case 'React.useState':
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case 'useReducer':
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case 'React.useReducer':
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case 'useEffect':
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case 'React.useEffect':
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case 'useLayoutEffect':
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case 'React.useLayoutEffect':
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case 'useMemo':
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case 'React.useMemo':
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case 'useCallback':
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case 'React.useCallback':
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case 'useRef':
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case 'React.useRef':
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case 'useContext':
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case 'React.useContext':
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case 'useImperativeMethods':
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case 'React.useImperativeMethods':
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case 'useDebugValue':
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case 'React.useDebugValue':
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return true;
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default:
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return false;
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}
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}
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function getHookCallsSignature(functionNode) {
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var fnHookCalls = hookCalls.get(functionNode);
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if (fnHookCalls === undefined) {
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return null;
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}
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return {
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key: fnHookCalls.map(function (call) {
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return call.name + '{' + call.key + '}';
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}).join('\n'),
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customHooks: fnHookCalls.filter(function (call) {
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return !isBuiltinHook(call.name);
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}).map(function (call) {
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return t.cloneDeep(call.callee);
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})
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};
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}
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var hasForceResetCommentByFile = new WeakMap(); // We let user do /* @refresh reset */ to reset state in the whole file.
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function hasForceResetComment(path) {
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var file = path.hub.file;
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var hasForceReset = hasForceResetCommentByFile.get(file);
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if (hasForceReset !== undefined) {
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return hasForceReset;
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}
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hasForceReset = false;
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var comments = file.ast.comments;
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for (var i = 0; i < comments.length; i++) {
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var cmt = comments[i];
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if (cmt.value.indexOf('@refresh reset') !== -1) {
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hasForceReset = true;
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break;
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}
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}
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hasForceResetCommentByFile.set(file, hasForceReset);
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return hasForceReset;
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}
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function createArgumentsForSignature(node, signature, scope) {
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var key = signature.key,
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customHooks = signature.customHooks;
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var forceReset = hasForceResetComment(scope.path);
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var customHooksInScope = [];
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customHooks.forEach(function (callee) {
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// Check if a corresponding binding exists where we emit the signature.
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var bindingName;
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switch (callee.type) {
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case 'MemberExpression':
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if (callee.object.type === 'Identifier') {
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bindingName = callee.object.name;
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}
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break;
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case 'Identifier':
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bindingName = callee.name;
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break;
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}
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if (scope.hasBinding(bindingName)) {
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customHooksInScope.push(callee);
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} else {
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// We don't have anything to put in the array because Hook is out of scope.
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// Since it could potentially have been edited, remount the component.
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forceReset = true;
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}
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});
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var finalKey = key;
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if (typeof require === 'function' && !opts.emitFullSignatures) {
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// Prefer to hash when we can (e.g. outside of ASTExplorer).
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// This makes it deterministically compact, even if there's
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// e.g. a useState initializer with some code inside.
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// We also need it for www that has transforms like cx()
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// that don't understand if something is part of a string.
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finalKey = require('crypto').createHash('sha1').update(key).digest('base64');
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}
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var args = [node, t.stringLiteral(finalKey)];
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if (forceReset || customHooksInScope.length > 0) {
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args.push(t.booleanLiteral(forceReset));
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}
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if (customHooksInScope.length > 0) {
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args.push( // TODO: We could use an arrow here to be more compact.
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// However, don't do it until AMA can run them natively.
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t.functionExpression(null, [], t.blockStatement([t.returnStatement(t.arrayExpression(customHooksInScope))])));
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}
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return args;
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}
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var seenForRegistration = new WeakSet();
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var seenForSignature = new WeakSet();
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var seenForOutro = new WeakSet();
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var hookCalls = new WeakMap();
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var HookCallsVisitor = {
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CallExpression: function (path) {
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var node = path.node;
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var callee = node.callee; // Note: this visitor MUST NOT mutate the tree in any way.
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// It runs early in a separate traversal and should be very fast.
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var name = null;
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switch (callee.type) {
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case 'Identifier':
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name = callee.name;
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break;
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case 'MemberExpression':
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name = callee.property.name;
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break;
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}
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if (name === null || !/^use[A-Z]/.test(name)) {
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return;
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}
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var fnScope = path.scope.getFunctionParent();
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if (fnScope === null) {
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return;
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} // This is a Hook call. Record it.
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var fnNode = fnScope.block;
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if (!hookCalls.has(fnNode)) {
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hookCalls.set(fnNode, []);
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}
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var hookCallsForFn = hookCalls.get(fnNode);
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var key = '';
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if (path.parent.type === 'VariableDeclarator') {
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// TODO: if there is no LHS, consider some other heuristic.
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key = path.parentPath.get('id').getSource();
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} // Some built-in Hooks reset on edits to arguments.
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var args = path.get('arguments');
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if (name === 'useState' && args.length > 0) {
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// useState second argument is initial state.
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key += '(' + args[0].getSource() + ')';
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} else if (name === 'useReducer' && args.length > 1) {
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// useReducer second argument is initial state.
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key += '(' + args[1].getSource() + ')';
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}
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hookCallsForFn.push({
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callee: path.node.callee,
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name: name,
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key: key
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});
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}
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};
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return {
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visitor: {
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ExportDefaultDeclaration: function (path) {
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var node = path.node;
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var decl = node.declaration;
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var declPath = path.get('declaration');
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if (decl.type !== 'CallExpression') {
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// For now, we only support possible HOC calls here.
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// Named function declarations are handled in FunctionDeclaration.
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// Anonymous direct exports like export default function() {}
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// are currently ignored.
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return;
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} // Make sure we're not mutating the same tree twice.
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// This can happen if another Babel plugin replaces parents.
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if (seenForRegistration.has(node)) {
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return;
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}
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seenForRegistration.add(node); // Don't mutate the tree above this point.
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// This code path handles nested cases like:
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// export default memo(() => {})
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// In those cases it is more plausible people will omit names
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// so they're worth handling despite possible false positives.
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// More importantly, it handles the named case:
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// export default memo(function Named() {})
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var inferredName = '%default%';
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var programPath = path.parentPath;
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findInnerComponents(inferredName, declPath, function (persistentID, targetExpr, targetPath) {
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if (targetPath === null) {
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// For case like:
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// export default hoc(Foo)
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// we don't want to wrap Foo inside the call.
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// Instead we assume it's registered at definition.
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return;
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}
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var handle = createRegistration(programPath, persistentID);
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targetPath.replaceWith(t.assignmentExpression('=', handle, targetExpr));
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});
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},
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FunctionDeclaration: {
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enter: function (path) {
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var node = path.node;
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var programPath;
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var insertAfterPath;
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switch (path.parent.type) {
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case 'Program':
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insertAfterPath = path;
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programPath = path.parentPath;
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break;
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case 'ExportNamedDeclaration':
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insertAfterPath = path.parentPath;
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programPath = insertAfterPath.parentPath;
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break;
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case 'ExportDefaultDeclaration':
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insertAfterPath = path.parentPath;
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programPath = insertAfterPath.parentPath;
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break;
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default:
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return;
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}
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var id = node.id;
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if (id === null) {
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// We don't currently handle anonymous default exports.
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return;
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}
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var inferredName = id.name;
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if (!isComponentishName(inferredName)) {
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return;
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} // Make sure we're not mutating the same tree twice.
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// This can happen if another Babel plugin replaces parents.
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if (seenForRegistration.has(node)) {
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return;
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}
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seenForRegistration.add(node); // Don't mutate the tree above this point.
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// export function Named() {}
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// function Named() {}
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findInnerComponents(inferredName, path, function (persistentID, targetExpr) {
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var handle = createRegistration(programPath, persistentID);
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insertAfterPath.insertAfter(t.expressionStatement(t.assignmentExpression('=', handle, targetExpr)));
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});
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},
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exit: function (path) {
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var node = path.node;
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var id = node.id;
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if (id === null) {
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return;
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}
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var signature = getHookCallsSignature(node);
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if (signature === null) {
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return;
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} // Make sure we're not mutating the same tree twice.
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// This can happen if another Babel plugin replaces parents.
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if (seenForSignature.has(node)) {
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return;
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}
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seenForSignature.add(node); // Don't mutate the tree above this point.
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var sigCallID = path.scope.generateUidIdentifier('_s');
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path.scope.parent.push({
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id: sigCallID,
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init: t.callExpression(refreshSig, [])
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}); // The signature call is split in two parts. One part is called inside the function.
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// This is used to signal when first render happens.
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path.get('body').unshiftContainer('body', t.expressionStatement(t.callExpression(sigCallID, []))); // The second call is around the function itself.
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// This is used to associate a type with a signature.
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// Unlike with $RefreshReg$, this needs to work for nested
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// declarations too. So we need to search for a path where
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// we can insert a statement rather than hard coding it.
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var insertAfterPath = null;
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path.find(function (p) {
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if (p.parentPath.isBlock()) {
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insertAfterPath = p;
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return true;
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}
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});
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if (insertAfterPath === null) {
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return;
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}
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insertAfterPath.insertAfter(t.expressionStatement(t.callExpression(sigCallID, createArgumentsForSignature(id, signature, insertAfterPath.scope))));
|
|
}
|
|
},
|
|
'ArrowFunctionExpression|FunctionExpression': {
|
|
exit: function (path) {
|
|
var node = path.node;
|
|
var signature = getHookCallsSignature(node);
|
|
|
|
if (signature === null) {
|
|
return;
|
|
} // Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
|
|
|
|
if (seenForSignature.has(node)) {
|
|
return;
|
|
}
|
|
|
|
seenForSignature.add(node); // Don't mutate the tree above this point.
|
|
|
|
var sigCallID = path.scope.generateUidIdentifier('_s');
|
|
path.scope.parent.push({
|
|
id: sigCallID,
|
|
init: t.callExpression(refreshSig, [])
|
|
}); // The signature call is split in two parts. One part is called inside the function.
|
|
// This is used to signal when first render happens.
|
|
|
|
if (path.node.body.type !== 'BlockStatement') {
|
|
path.node.body = t.blockStatement([t.returnStatement(path.node.body)]);
|
|
}
|
|
|
|
path.get('body').unshiftContainer('body', t.expressionStatement(t.callExpression(sigCallID, []))); // The second call is around the function itself.
|
|
// This is used to associate a type with a signature.
|
|
|
|
if (path.parent.type === 'VariableDeclarator') {
|
|
var insertAfterPath = null;
|
|
path.find(function (p) {
|
|
if (p.parentPath.isBlock()) {
|
|
insertAfterPath = p;
|
|
return true;
|
|
}
|
|
});
|
|
|
|
if (insertAfterPath === null) {
|
|
return;
|
|
} // Special case when a function would get an inferred name:
|
|
// let Foo = () => {}
|
|
// let Foo = function() {}
|
|
// We'll add signature it on next line so that
|
|
// we don't mess up the inferred 'Foo' function name.
|
|
|
|
|
|
insertAfterPath.insertAfter(t.expressionStatement(t.callExpression(sigCallID, createArgumentsForSignature(path.parent.id, signature, insertAfterPath.scope)))); // Result: let Foo = () => {}; __signature(Foo, ...);
|
|
} else {
|
|
// let Foo = hoc(() => {})
|
|
path.replaceWith(t.callExpression(sigCallID, createArgumentsForSignature(node, signature, path.scope))); // Result: let Foo = hoc(__signature(() => {}, ...))
|
|
}
|
|
}
|
|
},
|
|
VariableDeclaration: function (path) {
|
|
var node = path.node;
|
|
var programPath;
|
|
var insertAfterPath;
|
|
|
|
switch (path.parent.type) {
|
|
case 'Program':
|
|
insertAfterPath = path;
|
|
programPath = path.parentPath;
|
|
break;
|
|
|
|
case 'ExportNamedDeclaration':
|
|
insertAfterPath = path.parentPath;
|
|
programPath = insertAfterPath.parentPath;
|
|
break;
|
|
|
|
case 'ExportDefaultDeclaration':
|
|
insertAfterPath = path.parentPath;
|
|
programPath = insertAfterPath.parentPath;
|
|
break;
|
|
|
|
default:
|
|
return;
|
|
} // Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
|
|
|
|
if (seenForRegistration.has(node)) {
|
|
return;
|
|
}
|
|
|
|
seenForRegistration.add(node); // Don't mutate the tree above this point.
|
|
|
|
var declPaths = path.get('declarations');
|
|
|
|
if (declPaths.length !== 1) {
|
|
return;
|
|
}
|
|
|
|
var declPath = declPaths[0];
|
|
var inferredName = declPath.node.id.name;
|
|
findInnerComponents(inferredName, declPath, function (persistentID, targetExpr, targetPath) {
|
|
if (targetPath === null) {
|
|
// For case like:
|
|
// export const Something = hoc(Foo)
|
|
// we don't want to wrap Foo inside the call.
|
|
// Instead we assume it's registered at definition.
|
|
return;
|
|
}
|
|
|
|
var handle = createRegistration(programPath, persistentID);
|
|
|
|
if (targetPath.parent.type === 'VariableDeclarator') {
|
|
// Special case when a variable would get an inferred name:
|
|
// let Foo = () => {}
|
|
// let Foo = function() {}
|
|
// let Foo = styled.div``;
|
|
// We'll register it on next line so that
|
|
// we don't mess up the inferred 'Foo' function name.
|
|
// (eg: with @babel/plugin-transform-react-display-name or
|
|
// babel-plugin-styled-components)
|
|
insertAfterPath.insertAfter(t.expressionStatement(t.assignmentExpression('=', handle, declPath.node.id))); // Result: let Foo = () => {}; _c1 = Foo;
|
|
} else {
|
|
// let Foo = hoc(() => {})
|
|
targetPath.replaceWith(t.assignmentExpression('=', handle, targetExpr)); // Result: let Foo = hoc(_c1 = () => {})
|
|
}
|
|
});
|
|
},
|
|
Program: {
|
|
enter: function (path) {
|
|
// This is a separate early visitor because we need to collect Hook calls
|
|
// and "const [foo, setFoo] = ..." signatures before the destructuring
|
|
// transform mangles them. This extra traversal is not ideal for perf,
|
|
// but it's the best we can do until we stop transpiling destructuring.
|
|
path.traverse(HookCallsVisitor);
|
|
},
|
|
exit: function (path) {
|
|
var registrations = registrationsByProgramPath.get(path);
|
|
|
|
if (registrations === undefined) {
|
|
return;
|
|
} // Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
|
|
|
|
var node = path.node;
|
|
|
|
if (seenForOutro.has(node)) {
|
|
return;
|
|
}
|
|
|
|
seenForOutro.add(node); // Don't mutate the tree above this point.
|
|
|
|
registrationsByProgramPath.delete(path);
|
|
var declarators = [];
|
|
path.pushContainer('body', t.variableDeclaration('var', declarators));
|
|
registrations.forEach(function (_ref) {
|
|
var handle = _ref.handle,
|
|
persistentID = _ref.persistentID;
|
|
path.pushContainer('body', t.expressionStatement(t.callExpression(refreshReg, [handle, t.stringLiteral(persistentID)])));
|
|
declarators.push(t.variableDeclarator(handle));
|
|
});
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
module.exports = ReactFreshBabelPlugin;
|
|
})();
|
|
}
|