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98 lines
2.6 KiB
98 lines
2.6 KiB
3 years ago
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const DynamicExports = require("./DynamicExports");
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const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
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const HarmonyExports = require("./HarmonyExports");
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module.exports = class HarmonyDetectionParserPlugin {
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constructor(options) {
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const { topLevelAwait = false } = options || {};
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this.topLevelAwait = topLevelAwait;
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}
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apply(parser) {
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parser.hooks.program.tap("HarmonyDetectionParserPlugin", ast => {
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const isStrictHarmony = parser.state.module.type === "javascript/esm";
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const isHarmony =
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isStrictHarmony ||
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ast.body.some(
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statement =>
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statement.type === "ImportDeclaration" ||
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statement.type === "ExportDefaultDeclaration" ||
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statement.type === "ExportNamedDeclaration" ||
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statement.type === "ExportAllDeclaration"
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);
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if (isHarmony) {
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const module = parser.state.module;
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const compatDep = new HarmonyCompatibilityDependency();
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compatDep.loc = {
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start: {
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line: -1,
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column: 0
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},
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end: {
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line: -1,
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column: 0
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},
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index: -3
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};
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module.addPresentationalDependency(compatDep);
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DynamicExports.bailout(parser.state);
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HarmonyExports.enable(parser.state, isStrictHarmony);
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parser.scope.isStrict = true;
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}
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});
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parser.hooks.topLevelAwait.tap("HarmonyDetectionParserPlugin", () => {
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const module = parser.state.module;
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if (!this.topLevelAwait) {
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throw new Error(
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"The top-level-await experiment is not enabled (set experiments.topLevelAwait: true to enabled it)"
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);
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}
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if (!HarmonyExports.isEnabled(parser.state)) {
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throw new Error(
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"Top-level-await is only supported in EcmaScript Modules"
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);
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}
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module.buildMeta.async = true;
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});
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const skipInHarmony = () => {
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if (HarmonyExports.isEnabled(parser.state)) {
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return true;
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}
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};
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const nullInHarmony = () => {
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if (HarmonyExports.isEnabled(parser.state)) {
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return null;
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}
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};
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const nonHarmonyIdentifiers = ["define", "exports"];
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for (const identifier of nonHarmonyIdentifiers) {
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parser.hooks.evaluateTypeof
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.for(identifier)
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.tap("HarmonyDetectionParserPlugin", nullInHarmony);
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parser.hooks.typeof
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.for(identifier)
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.tap("HarmonyDetectionParserPlugin", skipInHarmony);
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parser.hooks.evaluate
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.for(identifier)
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.tap("HarmonyDetectionParserPlugin", nullInHarmony);
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parser.hooks.expression
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.for(identifier)
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.tap("HarmonyDetectionParserPlugin", skipInHarmony);
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parser.hooks.call
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.for(identifier)
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.tap("HarmonyDetectionParserPlugin", skipInHarmony);
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}
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}
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};
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