55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.remapAstLocations = remapAstLocations;
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function remapAstLocations(t, ast, map) {
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// remap ast to original mappings
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// This improves sourcemap accuracy and fixes sourcemaps when scope-hoisting
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traverseAll(t, ast.program, node => {
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if (node.loc) {
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var _node$loc;
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if ((_node$loc = node.loc) !== null && _node$loc !== void 0 && _node$loc.start) {
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let mapping = map.findClosestMapping(node.loc.start.line, node.loc.start.column);
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if (mapping !== null && mapping !== void 0 && mapping.original) {
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// $FlowFixMe
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node.loc.start.line = mapping.original.line;
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// $FlowFixMe
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node.loc.start.column = mapping.original.column;
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// $FlowFixMe
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let length = node.loc.end.column - node.loc.start.column;
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// $FlowFixMe
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node.loc.end.line = mapping.original.line;
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// $FlowFixMe
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node.loc.end.column = mapping.original.column + length;
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// $FlowFixMe
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node.loc.filename = mapping.source;
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} else {
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// Maintain null mappings?
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node.loc = null;
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}
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}
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}
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});
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}
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function traverseAll(t, node, visitor) {
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if (!node) {
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return;
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}
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visitor(node);
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for (let key of t.VISITOR_KEYS[node.type] || []) {
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// $FlowFixMe
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let subNode = node[key];
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if (Array.isArray(subNode)) {
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for (let i = 0; i < subNode.length; i++) {
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traverseAll(t, subNode[i], visitor);
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}
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} else {
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traverseAll(t, subNode, visitor);
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}
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}
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}
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