@mikro-orm/migrations/MigrationGenerator.js

TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, PostgreSQL and SQLite databases as well as usage with vanilla JavaScript.

/** Base class for generating migration source files from schema diffs. */
export class MigrationGenerator {
    driver;
    namingStrategy;
    options;
    constructor(driver, namingStrategy, options) {
        this.driver = driver;
        this.namingStrategy = namingStrategy;
        this.options = options;
    }
    /**
     * @inheritDoc
     */
    async generate(diff, path, name) {
        const { fs } = await import('@mikro-orm/core/fs-utils');
        /* v8 ignore next */
        const defaultPath = this.options.emit === 'ts' && this.options.pathTs ? this.options.pathTs : this.options.path;
        path = fs.normalizePath(this.driver.config.get('baseDir'), path ?? defaultPath);
        fs.ensureDir(path);
        const timestamp = new Date().toISOString().replace(/[-T:]|\.\d{3}z$/gi, '');
        const className = this.namingStrategy.classToMigrationName(timestamp, name);
        const fileName = `${this.options.fileName(timestamp, name)}.${this.options.emit}`;
        const ret = await this.generateMigrationFile(className, diff);
        await fs.writeFile(path + '/' + fileName, ret, { flush: true });
        return [ret, fileName];
    }
    /**
     * @inheritDoc
     */
    createStatement(sql, padLeft) {
        if (sql) {
            const padding = ' '.repeat(padLeft);
            return `${padding}this.addSql(\`${sql.replace(/[`$\\]/g, '\\$&')}\`);\n`;
        }
        return '\n';
    }
}