ts-strict-lint-migrate
v0.0.29
Published
Incrementally enforce typescript strict mode and lint selectively for new files (staged, and commited after date)
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ts-strict-lint-migrate
Migrating from JavaScript to strict TypeScript and ESLint all at once is hard.
This library makes the transition easy by strict type-checking and linting only new files added to git after the desired leak date, ie. the date you start your migration.
- Install the package
npm install --save-dev ts-strict-lint-migrate
- Add npm script command to your project's package.json to run ts-strict-lint-migrate
my-typescript-project/package.json
{
"name": "my-typescript-project",
"version": "0.0.1",
"main": "index.tsx",
"scripts": {
"start": "...",
"ts-strict-lint-migrate": "ts-node ./tsStrictLintMigrateRunner/run.ts"
},
"devDependencies": {
"ts-node": "^10.9.1",
"ts-strict-lint-migrate": "^0.0.9",
"typescript": "^4.8.4"
}
}
- Add new file to configure and run ts-strict-lint-migrate
my-typescript-project/tsStrictLintMigratRunner/run.ts
import {createTsStrictLintMigrate, RunTsStrictLintMigrateResult} from 'ts-strict-lint-migrate'
async function run(): Promise<void> {
const tsStrictLintMigrate = await createTsStrictLintMigrate({
// Base path of your repository directory.
// This is needed for git operations.
repoPath: `${__dirname}/../`,
// Files (or globs) to watch in watch mode
// (when watchIncludedFiles is true).
// This allows you to be more selective when watching,
// to reduce resource usage
watchFiles: [`${__dirname}/../src/**/*`],
// ignore files from the watchFiles array
ignoreFilesFromWatch: /some-file-regex.ts/,
// all committed files from this date to present
// that should strict type checked and linted
leakDate: "2020-01-01",
// In case you want to make sure no one can bypass your strict type checking
// and linting, you can turn on this option in your CI/CD pipeline
// so builds will fail for the given Pull Request if anyone
// tries to back-date files.
// This option includes ALL files committed in the current branch that
// are not in master, regardless of leakDate.
// default: false
includeAllCurrentBranchCommitedFilesNotInMaster: !!process.env.CI,
// This option is similar to the above, but respects
// the leak date. It is a more relaxed option to use in CI/CD,
// and theoretically could allow devs to bypass if they know
// how to back-date files.
// Any files in the current branch that were added after
// the leak date will be strict type checked and linted.
includeCurrentBranchCommitedFiles: !!process.env.CI,
// This option should be used in a pre-commit hook for good DX
// (also good to use in watch mode)
// default: false
includeStagedFiles: !process.env.CI,
// This option is great to use in watch mode
// default: false
includeUnstagedFiles: !process.env.CI,
// this option enables watch mode for any files included by the above options
// default: false
watchIncludedFiles: !process.env.CI,
// Any Typescript compiler options
tsConfig: {
// helpful to set baseUrl to
// adjust ts import paths
baseUrl: `${__dirname}/../src`,
paths: {
"some-alias/*": ["*"],
}
},
// Any eslint configuration
esLintConfig: {
settings: {
// react version is required as it should not be inferred
"react": {
"version": "16.6.3"
}
}
},
onResults: ({success, lintResults, tsResults}: RunTsStrictLintMigrateResult)=>{
if(!success){
tsResults?.prettyResult && console.log("\nTypescript Errors\n\n", tsResults.prettyResult)
lintResults?.prettyResult && console.log("\nESLint Errors\n\n", lintResults.prettyResult)
console.error("\n\nFailed ts strict type checking and linting. Please fixe the errors above. \n\n")
// Exit process error if running in CI
if(process.env.CI){
process.exit(1)
}
}
}
})
await tsStrictLintMigrate.run()
}
run().catch((e)=>{
console.error(e)
process.exit(1)
})
- Run the script from the command line of your project
npm run ts-strict-lint-migrate