feat(emigrate): add support for reading config from emigrate.config.js (and others)

Also add a new "extension" option for generating empty migration files with the right file extension.

.changeset/little-moons-rush.md

@@ -0,0 +1,5 @@
+---
+'emigrate': minor
+---
+
+Add the "extension" option for the "new" command to be able to generate empty migration files without any plugin and template and still get the right file extension. It can also be used together with the "template" option to override the template file's file extension when saving the new migration file.

.changeset/shaggy-doors-trade.md

@@ -0,0 +1,5 @@
+---
+'emigrate': minor
+---
+
+Support reading config from for instance emigrate.config.js

packages/emigrate/package.json

@@ -8,6 +8,12 @@
   "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
   "bin": {
     "emigrate": "dist/cli.js"
   },
@@ -28,7 +34,8 @@
   "author": "Aboviq AB <dev@aboviq.com> (https://www.aboviq.com)",
   "license": "MIT",
   "dependencies": {
-    "@emigrate/plugin-tools": "workspace:*"
+    "@emigrate/plugin-tools": "workspace:*",
+    "cosmiconfig": "8.3.6"
   },
   "volta": {
     "extends": "../../package.json"

packages/emigrate/src/cli.ts

@@ -2,6 +2,7 @@
 import process from 'node:process';
 import { parseArgs } from 'node:util';
 import { ShowUsageError } from './show-usage-error.js';
+import { getConfig } from './get-config.js';
 
 type Action = (args: string[]) => Promise<void>;
 
@@ -57,6 +58,7 @@ Examples:
 };
 
 const newMigration: Action = async (args) => {
+  const config = await getConfig('new');
   const { values, positionals } = parseArgs({
     args,
     options: {
@@ -72,6 +74,10 @@ const newMigration: Action = async (args) => {
         type: 'string',
         short: 't',
       },
+      extension: {
+        type: 'string',
+        short: 'e',
+      },
       plugin: {
         type: 'string',
         short: 'p',
@@ -92,13 +98,18 @@ Options:
   -d, --directory  The directory where the migration files are located (required)
   -p, --plugin     The plugin(s) to use (can be specified multiple times)
   -t, --template   A template file to use as contents for the new migration file
+                   (if the extension option is not provided the template file's extension will be used)
+  -e, --extension  The extension to use for the new migration file
+                   (if no template or plugin is provided an empty migration file will be created with the given extension)
 
-  Either the --template or the --plugin option is required must be specified
+  One of the --template, --extension or the --plugin options must be specified
 
 Examples:
 
   emigrate new -d src/migrations -t migration-template.js create users table
   emigrate new --directory ./migrations --plugin @emigrate/plugin-generate-sql create_users_table
+  emigrate new -d ./migrations -e .sql create_users_table
+  emigrate new -d ./migrations -t .migration-template -e .sql "drop some table"
 `;
 
   if (values.help) {
@@ -107,12 +118,13 @@ Examples:
     return;
   }
 
-  const { plugin: plugins = [], directory, template } = values;
+  const { directory = config.directory, template = config.template, extension = config.extension } = values;
+  const plugins = [...(config.plugins ?? []), ...(values.plugin ?? [])];
   const name = positionals.join(' ').trim();
 
   try {
     const { default: newCommand } = await import('./new-command.js');
-    await newCommand({ directory, template, plugins, name });
+    await newCommand({ directory, template, plugins, name, extension });
   } catch (error) {
     if (error instanceof ShowUsageError) {
       console.error(error.message, '\n');

packages/emigrate/src/get-config.ts

@@ -0,0 +1,20 @@
+import { cosmiconfig } from 'cosmiconfig';
+import { type Config, type EmigrateConfig } from './types.js';
+
+export const getConfig = async (command: 'up' | 'list' | 'new'): Promise<Config> => {
+  const explorer = cosmiconfig('emigrate');
+
+  const result = await explorer.search();
+
+  if (!result?.config) {
+    return {};
+  }
+
+  const { plugins, directory, template, ...commandsConfig } = result.config as EmigrateConfig;
+
+  if (commandsConfig[command]) {
+    return { plugins, directory, template, ...commandsConfig[command] };
+  }
+
+  return { plugins, directory, template };
+};

packages/emigrate/src/index.ts

@@ -1,3 +1,5 @@
+export * from './types.js';
+
 export const emigrate = () => {
   console.log('Done!');
 };

packages/emigrate/src/new-command.ts

@@ -1,18 +1,19 @@
 import process from 'node:process';
 import fs from 'node:fs/promises';
 import path from 'node:path';
-import { getTimestampPrefix, sanitizeMigrationName, loadPlugin } from '@emigrate/plugin-tools';
+import { getTimestampPrefix, sanitizeMigrationName, loadPlugin, isGeneratorPlugin } from '@emigrate/plugin-tools';
-import { type GeneratorPlugin } from '@emigrate/plugin-tools/types';
+import { type Plugin, type GeneratorPlugin } from '@emigrate/plugin-tools/types';
 import { ShowUsageError } from './show-usage-error.js';
 
 type NewCommandOptions = {
   directory?: string;
   template?: string;
-  plugins: string[];
+  extension?: string;
+  plugins: Array<string | Plugin>;
   name?: string;
 };
 
-export default async function newCommand({ directory, template, plugins, name }: NewCommandOptions) {
+export default async function newCommand({ directory, template, plugins, name, extension }: NewCommandOptions) {
   if (!directory) {
     throw new ShowUsageError('Missing required option: directory');
   }
@@ -21,8 +22,8 @@ export default async function newCommand({ directory, template, plugins, name }:
     throw new ShowUsageError('Missing required migration name');
   }
 
-  if (!template && plugins.length === 0) {
+  if (!extension && !template && plugins.length === 0) {
-    throw new ShowUsageError('Missing required option: template or plugin');
+    throw new ShowUsageError('Missing required option: extension, template or plugin');
   }
 
   let filename: string | undefined;
@@ -31,7 +32,7 @@ export default async function newCommand({ directory, template, plugins, name }:
   if (template) {
     const fs = await import('node:fs/promises');
     const templatePath = path.resolve(process.cwd(), template);
-    const extension = path.extname(templatePath);
+    const fileExtension = path.extname(templatePath);
 
     try {
       content = await fs.readFile(templatePath, 'utf8');
@@ -40,12 +41,17 @@ export default async function newCommand({ directory, template, plugins, name }:
       throw new Error(`Failed to read template file: ${templatePath}`, { cause: error });
     }
 
-    filename = `${getTimestampPrefix()}_${sanitizeMigrationName(name)}${extension}`;
+    filename = `${getTimestampPrefix()}_${sanitizeMigrationName(name)}${extension ?? fileExtension}`;
   } else if (plugins.length > 0) {
     let generatorPlugin: GeneratorPlugin | undefined;
 
     for await (const plugin of plugins) {
-      generatorPlugin = await loadPlugin('generator', plugin);
+      if (isGeneratorPlugin(plugin)) {
+        generatorPlugin = plugin;
+        break;
+      }
+
+      generatorPlugin = typeof plugin === 'string' ? await loadPlugin('generator', plugin) : undefined;
 
       if (generatorPlugin) {
         break;
@@ -60,9 +66,12 @@ export default async function newCommand({ directory, template, plugins, name }:
 
     filename = generated.filename;
     content = generated.content;
+  } else if (extension) {
+    content = '';
+    filename = `${getTimestampPrefix()}_${sanitizeMigrationName(name)}${extension}`;
   }
 
-  if (!filename || !content) {
+  if (!filename || content === undefined) {
     throw new Error('Unexpected error, missing filename or content for migration file');
   }
 

packages/emigrate/src/types.ts

@@ -0,0 +1,16 @@
+import { type Plugin } from '@emigrate/plugin-tools/types';
+
+export type EmigratePlugin = Plugin;
+
+export type Config = {
+  plugins?: Array<string | EmigratePlugin>;
+  directory?: string;
+  template?: string;
+  extension?: string;
+};
+
+export type EmigrateConfig = Config & {
+  up?: Config;
+  new?: Config;
+  list?: Config;
+};

packages/tsconfig/base.json

@@ -24,6 +24,7 @@
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "preserveWatchOutput": true,
+    "preserveSymlinks": true,
     "resolveJsonModule": false,
     "skipLibCheck": true,
     "sourceMap": true,

pnpm-lock.yaml

@@ -59,6 +59,9 @@ importers:
       '@emigrate/plugin-tools':
         specifier: workspace:*
         version: link:../plugin-tools
+      cosmiconfig:
+        specifier: 8.3.6
+        version: 8.3.6(typescript@5.2.2)
     devDependencies:
       '@emigrate/tsconfig':
         specifier: workspace:*