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link.ts
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link.ts
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import chalk from 'chalk';
import chokidar, { FSWatcher } from 'chokidar';
import execa, { ExecaChildProcess } from 'execa';
import fsExtra from 'fs-extra';
import ora from 'ora';
import path from 'path';
import { mergeDeepRight } from 'ramda';
import { cleanups } from './cleanup';
import { Package, resolvePackage } from './package';
import { Project, resolveProject } from './project';
import { markAsLinked } from './state';
const { bold, cyan, yellow } = chalk;
export async function link(packagePaths: string[], cwd: string) {
let firstInstallation = true;
let currentInstallation: Installation | null = null;
console.clear();
const project = resolveProject(cwd);
cleanups.add(() => fsExtra.remove(project.cachePath));
const packages = packagePaths.map(resolvePackage);
const syncer = createSyncer(packages, project);
await ensureDependencyOn(packages, project);
const specsToWatch = packages.map(pkg => pkg.spec.path);
chokidar.watch(specsToWatch).on('change', installAndSync);
installAndSync();
async function installAndSync() {
if (currentInstallation == null) {
syncer.stop();
if (firstInstallation === false) console.clear();
firstInstallation = false;
currentInstallation = installPackages(packages, project);
const result = await currentInstallation.result;
if (result === 'success') {
syncer.start();
}
currentInstallation = null;
} else {
await currentInstallation.cancel();
currentInstallation = null;
installAndSync();
}
}
}
async function ensureDependencyOn(packages: Package[], project: Project) {
const spinner = ora({ text: cyan('Checking project dependencies') }).start();
try {
await Promise.all(
packages.map(({ name }) =>
execa('yarn', ['why', name], { cwd: project.root }).then(({ stderr }) => {
if (stderr != null && stderr !== '') {
throw Error(
yellow(`${bold(name)} is not a project's dependency!\n`) +
`Please add this package as dependency and run ${bold('yarn install')}.`
);
}
})
)
);
} catch (e) {
spinner.fail(e.message);
process.exit(1);
}
spinner.succeed();
}
function installPackages(packages: Package[], project: Project): Installation {
let childProcess: ExecaChildProcess;
const spinner = ora({ text: cyan('Installing transitive dependencies') }).start();
return {
result: run(),
cancel: async () => {
childProcess.cancel();
await childProcess.catch(() => null);
}
};
async function run(): Promise<InstallationResult> {
const originalProjectSpec = project.spec.get();
const cleanup = () => project.spec.set(originalProjectSpec);
cleanups.add(cleanup);
try {
const resolutions = copyPackagesToCache(packages, project);
const updatedProjectSpec = mergeDeepRight(originalProjectSpec, { resolutions });
project.spec.set(updatedProjectSpec);
childProcess = execa('yarn', ['install', '--force', '--pure-lockfile', '--non-interactive']);
await childProcess;
cleanups.delete(cleanup);
cleanup();
spinner.succeed();
return 'success';
} catch (e) {
cleanups.delete(cleanup);
cleanup();
if (e.isCanceled) {
spinner.fail('Installation aborted due to change in package manifest.');
return 'canceled';
}
spinner.fail('Installation failed with the following error:');
console.error(e.message);
console.log(
yellow.inverse(
"Process will try to reinstall transitive dependencies on next change in linked package's manifest."
)
);
return 'error';
}
}
}
interface Installation {
cancel(): Promise<void>;
readonly result: Promise<InstallationResult>;
}
type InstallationResult = 'success' | 'canceled' | 'error';
function createSyncer(packages: Package[], project: Project) {
let watchers: FSWatcher[] = [];
return {
start() {
if (watchers.length > 0) return;
watchers = packages.map(pkg =>
chokidar
.watch(pkg.root, { ignored: toWatchIgnoredPaths(pkg) })
.on('all', (event, eventPath) => {
if (eventPath === pkg.root) return;
const relativeEventPath = path.relative(pkg.root, eventPath);
const target = `${project.root}/node_modules/${pkg.name}/${relativeEventPath}`;
switch (event) {
case 'add':
case 'change':
fsExtra.copy(eventPath, target).catch(console.error);
return;
case 'addDir':
fsExtra.ensureDir(target).catch(console.error);
return;
case 'unlink':
case 'unlinkDir':
fsExtra.remove(target).catch(console.error);
return;
default:
throw Error('Unexpected FS event!');
}
})
);
markAsLinked(packages, project);
console.info('🚧 Keeping packages in sync...');
},
stop() {
watchers.forEach(watcher => watcher.close());
watchers = [];
markAsLinked([], project);
}
};
}
function toWatchIgnoredPaths(pkg: Package) {
// TODO: read .npmignore or .gitignore
// TODO: read "files" property in package's spec
// TODO: make sure you restart watchers when .ignore files change
return [pkg.spec.path, '**/.git/**', '**/node_modules/**'];
}
function copyPackagesToCache(
packages: Package[],
project: Project
): { [packageName: string]: string } {
fsExtra.removeSync(project.cachePath);
const resolutions = packages.reduce(
(result, pkg) => ({ ...result, [pkg.name]: `${project.cachePath}/${pkg.name}` }),
{}
);
// todo: copy only non-ignored files & package.json
packages.forEach(pkg => {
fsExtra.copySync(pkg.root, resolutions[pkg.name], {
filter: (src, des) => !src.includes('/node_modules') && !src.includes('/.git')
});
});
return resolutions;
}