typeorm-explain/esm/index.js

Tiny helper to wrap TypeORM's query builder queries to EXPLAIN

import { getConnection } from 'typeorm';
const explains = {
    postgres(originalQuery, explainParameters = {
        analyze: true,
        verbose: true,
        buffers: true,
    }, format) {
        const boolParameters = Object.entries(explainParameters)
            .filter((argument) => typeof argument[1] === 'boolean')
            .map(([key, value]) => `${key} ${value}`);
        const explainParametersString = [...boolParameters, `FORMAT ${format.toUpperCase()}`]
            .join(', ')
            .toUpperCase();
        return `EXPLAIN (${explainParametersString}) ${originalQuery}`;
    },
};
export default async function explain(qb, explainParameters, format = 'text', connection = getConnection()) {
    const { type } = connection.driver.options;
    const [originalQuery, queryParameters] = qb.getQueryAndParameters();
    const explainBuilder = explains[type];
    if (!explainBuilder) {
        const driversList = Object.keys(explains).join(',');
        throw new Error(`typeorm-explain currently support limited db drivers (${driversList}). Feel free open PR to support your driver: ${type}`);
    }
    const query = explainBuilder(originalQuery, explainParameters, format);
    return connection.query(query, queryParameters);
}
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