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4 |
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5 | "use strict";
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6 |
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7 | const createHash = require("./util/createHash");
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8 | const RequestShortener = require("./RequestShortener");
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9 |
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10 | const getHash = str => {
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11 | const hash = createHash("md4");
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12 | hash.update(str);
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13 | const digest = (hash.digest("hex"));
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14 | return digest.substr(0, 4);
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15 | };
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16 |
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17 | class NamedModulesPlugin {
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18 | constructor(options) {
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19 | this.options = options || {};
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20 | }
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21 |
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22 | apply(compiler) {
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23 | compiler.hooks.compilation.tap("NamedModulesPlugin", compilation => {
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24 | compilation.hooks.beforeModuleIds.tap("NamedModulesPlugin", modules => {
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25 | const namedModules = new Map();
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26 | const context = this.options.context || compiler.options.context;
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27 |
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28 | for (const module of modules) {
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29 | if (module.id === null && module.libIdent) {
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30 | module.id = module.libIdent({ context });
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31 | }
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32 |
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33 | if (module.id !== null) {
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34 | const namedModule = namedModules.get(module.id);
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35 | if (namedModule !== undefined) {
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36 | namedModule.push(module);
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37 | } else {
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38 | namedModules.set(module.id, [module]);
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39 | }
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40 | }
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41 | }
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42 |
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43 | for (const namedModule of namedModules.values()) {
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44 | if (namedModule.length > 1) {
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45 | for (const module of namedModule) {
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46 | const requestShortener = new RequestShortener(context);
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47 | module.id = `${module.id}?${getHash(
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48 | requestShortener.shorten(module.identifier())
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49 | )}`;
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50 | }
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51 | }
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52 | }
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53 | });
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54 | });
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55 | }
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56 | }
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57 |
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58 | module.exports = NamedModulesPlugin;
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