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HarmonyExportInitFragment.js
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Tue, Feb 4, 08:52

HarmonyExportInitFragment.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const InitFragment = require("../InitFragment");
const RuntimeGlobals = require("../RuntimeGlobals");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../Generator").GenerateContext} GenerateContext */
const joinIterableWithComma = iterable => {
// This is more performant than Array.from().join(", ")
// as it doesn't create an array
let str = "";
let first = true;
for (const item of iterable) {
if (first) {
first = false;
} else {
str += ", ";
}
str += item;
}
return str;
};
const EMPTY_MAP = new Map();
const EMPTY_SET = new Set();
class HarmonyExportInitFragment extends InitFragment {
/**
* @param {string} exportsArgument the exports identifier
* @param {Map<string, string>} exportMap mapping from used name to exposed variable name
* @param {Set<string>} unusedExports list of unused export names
*/
constructor(
exportsArgument,
exportMap = EMPTY_MAP,
unusedExports = EMPTY_SET
) {
super(undefined, InitFragment.STAGE_HARMONY_EXPORTS, 1, "harmony-exports");
this.exportsArgument = exportsArgument;
this.exportMap = exportMap;
this.unusedExports = unusedExports;
}
merge(other) {
let exportMap;
if (this.exportMap.size === 0) {
exportMap = other.exportMap;
} else if (other.exportMap.size === 0) {
exportMap = this.exportMap;
} else {
exportMap = new Map(other.exportMap);
for (const [key, value] of this.exportMap) {
if (!exportMap.has(key)) exportMap.set(key, value);
}
}
let unusedExports;
if (this.unusedExports.size === 0) {
unusedExports = other.unusedExports;
} else if (other.unusedExports.size === 0) {
unusedExports = this.unusedExports;
} else {
unusedExports = new Set(other.unusedExports);
for (const value of this.unusedExports) {
unusedExports.add(value);
}
}
return new HarmonyExportInitFragment(
this.exportsArgument,
exportMap,
unusedExports
);
}
/**
* @param {GenerateContext} generateContext context for generate
* @returns {string|Source} the source code that will be included as initialization code
*/
getContent({ runtimeTemplate, runtimeRequirements }) {
runtimeRequirements.add(RuntimeGlobals.exports);
runtimeRequirements.add(RuntimeGlobals.definePropertyGetters);
const unusedPart =
this.unusedExports.size > 1
? `/* unused harmony exports ${joinIterableWithComma(
this.unusedExports
)} */\n`
: this.unusedExports.size > 0
? `/* unused harmony export ${
this.unusedExports.values().next().value
} */\n`
: "";
const definitions = [];
for (const [key, value] of this.exportMap) {
definitions.push(
`\n/* harmony export */ ${JSON.stringify(
key
)}: ${runtimeTemplate.returningFunction(value)}`
);
}
const definePart =
this.exportMap.size > 0
? `/* harmony export */ ${RuntimeGlobals.definePropertyGetters}(${
this.exportsArgument
}, {${definitions.join(",")}\n/* harmony export */ });\n`
: "";
return `${definePart}${unusedPart}`;
}
}
module.exports = HarmonyExportInitFragment;

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