nestjs-esm-fix

Patch Nestjs app ESM bundles to make them work RHRN

Problem

openapi is not defined. https://github.com/nestjs/swagger/issues/1450

__decorate([
    Post('event-unsafe-batch'),
    HttpCode(200),
    openapi.ApiResponse({ status: 200, type: String }),
    __param(0, Body()),
    __param(1, Req()),
    __metadata("design:type", Function),
    __metadata("design:paramtypes", [Object, Object]),
    __metadata("design:returntype", Promise)
], EventUnsafeController.prototype, "logEventBatch", null);

openapi / class-validator DTOs are referenced by require API.

export class CspReportDto {
    static _OPENAPI_METADATA_FACTORY() {
        return { timestamp: { required: false, type: () => Object }, 'csp-report': { required: true, type: () => require("./csp.dto.js").CspReport } };
    }
}

Solution

Old good monkey patching.

Install

yarn add -D nestjs-esm-fix

Usage

CLI

nestjs-esm-fix target/**/*.js

Option	Description	Default
`--openapi-var`	Inject openapi variable. Set `--no-openapi-var` to disable.	true
`--openapi-type-ref`	Replace `type: () => require` statements with `import`.	true

JS API

import {fix} from 'nestjs-esm-fix'
await fix({
  cwd: '.',
  target: 'target/**/*.js',
  openapiVar: true,
  openapiTypeRef: true,
})

License

MIT