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import fs from "fs";
import path from "path";
import webpack from "webpack";
/**
* Webpack plugin that reads all JSON rule files from `src/rules/`,
* assigns sequential IDs to each rule, and emits a single `rules.json`
* asset used by `declarativeNetRequest`.
*/
class CreateRulesPlugin {
/**
* @param {import("webpack").Compiler} compiler
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap("CreateRulesPlugin", (compilation) => {
compilation.hooks.processAssets.tap(
{
name: "CreateRulesPlugin",
stage: compiler.webpack.Compilation.PROCESS_ASSETS_STAGE_ADDITIONAL
},
(_assets) => {
const ruleFileNames = fs.readdirSync(path.resolve(SOURCE_DIR, "rules"));
const rules = [];
let ruleId = 1;
for (const ruleFileName of ruleFileNames) {
const rule = JSON.parse(fs.readFileSync(path.resolve("src/rules", ruleFileName)));
if (rule instanceof Array) {
for (const currentRule of rule) {
currentRule.id = ruleId++;
rules.push(currentRule);
}
} else {
rule.id = ruleId++;
rules.push(rule);
}
}
compilation.emitAsset(
"rules.json",
new webpack.sources.RawSource(
JSON.stringify(
rules,
undefined,
process.env.NODE_ENV === "production"
? undefined
: "\t"
)
)
);
}
);
});
}
}
export default CreateRulesPlugin;
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