tsc-hooks/lib/injection.js

Add tsc compiler hooks to your TypeScript project

const fs = require('fs');
const JSON5 = require('json5');
const path = require('path');

const requireHook = require('./utils/requireHook');
const installDependencies = require('./utils/installDependencies');

const tsconfigDir = process.cwd();
const tsconfigPath = path.resolve(process.cwd(), 'tsconfig.json');

if (fs.existsSync(tsconfigPath)) {
	const tsconfigStr = fs.readFileSync(tsconfigPath);
	const tsconfig = JSON5.parse(tsconfigStr);
	const hookModules = [], dependencies = [];

	for (const hook of tsconfig.hooks || []) {
		// Get Hook by URL, by Official ID, or by Path
		const hookModule = requireHook(hook, tsconfigDir);

		// Add dependencies
		dependencies.push(...hookModule.dependencies);

		// Add hookModule
		hookModules.push(hookModule);
	}

	// Install dependencies
	installDependencies(dependencies);

	// Create TSC Hook API
	const ignoredConfigOptions = [ 'save', 'ignore', 'path', 'directory' ];
	const api = {
		tsconfig: {
			...tsconfig,
			save: function() {
				const tsconfigCopy = { ...api.tsconfig };
				for (const ignoredConfigOption of ignoredConfigOptions) {
					eval(`delete tsconfigCopy.${ignoredConfigOption}`);
				}
				fs.writeFileSync(tsconfigPath, JSON.stringify(tsconfigCopy, null, 2));
			},
			ignore: function(configOption) {
				ignoredConfigOptions.push(configOption);
				api.tsconfig.save();
			},
			path: tsconfigPath,
			directory: tsconfigDir
		}
	};

	// Call each hook
	for (const hookModule of hookModules || []) {
		hookModule?.onInitCompilation?.(api);
		process.on('exit', () => hookModule?.onPostCompilation?.(api));
	}

	// Hooks may mutate the config, so write the original config back
	process.on('exit', () => fs.writeFileSync(tsconfigPath, tsconfigStr));
}