2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
module.exports = class HarmonyDetectionParserPlugin {
apply(parser) {
parser.plugin("program", (ast) => {
const isHarmony = ast.body.some(statement => {
return /^(Import|Export).*Declaration$/.test(statement.type);
});
if(isHarmony) {
const module = parser.state.module;
const dep = new HarmonyCompatibilityDependency(module);
dep.loc = {
start: {
line: -1,
column: 0
},
end: {
line: -1,
column: 0
},
index: -2
};
module.addDependency(dep);
module.meta.harmonyModule = true;
module.strict = true;
module.exportsArgument = "__webpack_exports__";
}
});
const nonHarmonyIdentifiers = ["define", "exports"];
nonHarmonyIdentifiers.forEach(identifer => {
parser.plugin(`evaluate typeof ${identifer}`, nullInHarmony);
parser.plugin(`typeof ${identifer}`, skipInHarmony);
parser.plugin(`evaluate ${identifer}`, nullInHarmony);
parser.plugin(`expression ${identifer}`, skipInHarmony);
parser.plugin(`call ${identifer}`, skipInHarmony);
});
function skipInHarmony() {
const module = this.state.module;
if(module && module.meta && module.meta.harmonyModule)
return true;
}
function nullInHarmony() {
const module = this.state.module;
if(module && module.meta && module.meta.harmonyModule)
return null;
}
}
};
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