Nestgen

Nestjs code generator for openapi.

Early alhpa - docs subject to change.

Table of Contents

• Install
• Quickstart
• Config

Install

Install from src (pre-release)

npm install
npm run build
npm pack
# from consumer project: npm i -D /path/to/oas-nestgen-0.0.1.tgz
# do the same for oas-typegen. you may need to install typegen first if there are issues with install

post-release:

npm install --save-dev @acrontum/oas-nestgen

Quickstart

npx oas-nestgen

Most up to date docs are in the cli help

npx oas-nestgen -h

Config

By default, nestgen looks for nestgen, nestgen.js, and nestgen.json. Config files extend the default config, and cli args overwrite both.

All config options are available from the cli with the exception of override functions - those must be configured in a config file.

Default config:

export const config: Config = {
  // -c, --config-file FILE             Config file name or path (default nestgen)
  configFile: 'nestgen',
  // -i, --typegen-path FILE            Path to typegen json (default typegen.json)
  typegenPath: 'typegen.json',
  // -s, --stub-service VALUE           If true, generate stubbed service methods (default true)
  stubService: true,

  // -d, --dry-run                      Just print changes, if any (default false)
  dryRun: false,

  // -a, --app-module-path PATH         Path to main app module (default ./src/app.module.ts)
  appModulePath: './src/app.module.ts',
  // -m, --modules-path PATH            Path to modules folder (default ./src/modules/)
  modulesPath: './src/modules/',
  // -o, --op-id-decorator-path PATH    OpId decorator file path (default ./src/common/decorators/op-id.decorator.ts)
  opIdDecoratorPath: './src/common/decorators/op-id.decorator.ts',

  // -O, --op-id-decorator-import NAME  OpId decorator import name (default src/common/decorators/op-id.decorator)
  opIdDecoratorImport: 'src/common/decorators/op-id.decorator',
  // -T, --types-import NAME            Typings import name (default src/types)
  typesImport: 'src/types',

  // -I, --ignored-op-ids NAME          Ignore changes for opId (can be invoked multiple times)
  ignoredOpIds: null,

  // codegen methods used to name params, add decorators, etc for when the defaults don't work for your project
  // rtfm for now src/parse-typegen exports all of these
  getMethodName,
  getReturnValue,
  namePathParams,
  nameQueryParams,
  nameHeadersParams,
  isDefaultProduces,
  extraDecorators,
  getMethodControllerName,
  getSubPath,
  getBodyParams,
  getControllerDecorators,
};

Example config override:

// my-custom-thingy.js

const { getMethodName: defaultGetMethodName } = require('oas-nestgen/dist/parse-typegen');

module.exports = {
  typegenPath: '/tmp/typegen.json',
  stubService: false,
  getMethodName(method/*: TypeGenMethod*/, basename/*: string*/) {
    const original = defaultGetMethodName(method, basename);

    if (original.indexOf('get') === 0) {
      const suffix = original.slice(3);

      return (/\}\/$/.test(method.path.name)) ? `show${suffix}` : `list${suffix}`;
    }

    return original;
  }
}

npx oas-nestgen -c ./my-custom-thingy.js --dry-run