HarmonyDetectionParserPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
const HarmonyInitDependency = require("./HarmonyInitDependency");
module.exports = class HarmonyDetectionParserPlugin {
apply(parser) {
parser.hooks.program.tap("HarmonyDetectionParserPlugin", ast => {
const isStrictHarmony = parser.state.module.type === "javascript/esm";
const isHarmony =
isStrictHarmony ||
ast.body.some(
statement =>
statement.type === "ImportDeclaration" ||
statement.type === "ExportDefaultDeclaration" ||
statement.type === "ExportNamedDeclaration" ||
statement.type === "ExportAllDeclaration"
);
if (isHarmony) {
const module = parser.state.module;
const compatDep = new HarmonyCompatibilityDependency(module);
compatDep.loc = {
start: {
line: -1,
column: 0
},
end: {
line: -1,
column: 0
},
index: -3
};
module.addDependency(compatDep);
const initDep = new HarmonyInitDependency(module);
initDep.loc = {
start: {
line: -1,
column: 0
},
end: {
line: -1,
column: 0
},
index: -2
};
module.addDependency(initDep);
parser.state.harmonyParserScope = parser.state.harmonyParserScope || {};
parser.scope.isStrict = true;
module.buildMeta.exportsType = "namespace";
module.buildInfo.strict = true;
module.buildInfo.exportsArgument = "__webpack_exports__";
if (isStrictHarmony) {
module.buildMeta.strictHarmonyModule = true;
module.buildInfo.moduleArgument = "__webpack_module__";
}
}
});
const skipInHarmony = () => {
const module = parser.state.module;
if (module && module.buildMeta && module.buildMeta.exportsType) {
return true;
}
};
const nullInHarmony = () => {
const module = parser.state.module;
if (module && module.buildMeta && module.buildMeta.exportsType) {
return null;
}
};
const nonHarmonyIdentifiers = ["define", "exports"];
for (const identifer of nonHarmonyIdentifiers) {
parser.hooks.evaluateTypeof
.for(identifer)
.tap("HarmonyDetectionParserPlugin", nullInHarmony);
parser.hooks.typeof
.for(identifer)
.tap("HarmonyDetectionParserPlugin", skipInHarmony);
parser.hooks.evaluate
.for(identifer)
.tap("HarmonyDetectionParserPlugin", nullInHarmony);
parser.hooks.expression
.for(identifer)
.tap("HarmonyDetectionParserPlugin", skipInHarmony);
parser.hooks.call
.for(identifer)
.tap("HarmonyDetectionParserPlugin", skipInHarmony);
}
}
};