@nestjs-modules/mailer@3.0.0

Major Changes

• #1325 d47ee96 Thanks @juandav! - Template engines are no longer installed automatically.

  ejs, handlebars, liquidjs, mjml, nunjucks, preview-email, pug and their @types/* packages were listed both as optional peerDependencies and as optionalDependencies. npm, pnpm and yarn install optionalDependencies by default, so every project got all of them (and their transitive dependencies) even when using a single engine. They are now only optional peer dependencies, as the documentation already described (#1320).

  Migration: install the engine used by your adapter, e.g. pnpm add handlebars for HandlebarsAdapter, and preview-email if you use the preview option. Projects that already followed the installation guide need no changes.

• #1328 647406d Thanks @juandav! - Secure defaults for 3.0.

  • Breaking: {{key}} placeholders in an inline html string are now HTML-escaped. Use {{{key}}} to insert trusted markup. Subject and text templates are not escaped.
  • Breaking: CSS inlining no longer fetches remote stylesheets. loadRemoteStylesheets defaults to false and is kept when you pass your own inlineCssOptions; set it to true to opt back in.
  • Breaking: the Pug adapter compiles with template.options only. Context values can no longer change compiler options such as basedir, filename or plugins. They are still available as template variables.
  • Breaking: MailerHealthIndicator no longer returns the error message when transporter verification throws. The error is logged instead.
  • Placeholder interpolation only reads the context's own properties, so keys like constructor are never rendered.

Minor Changes

• #1326 6cc304f Thanks @juandav! - Support NestJS 12. The module is tested against NestJS 11 and 12 in CI, and Nest types are now imported from the @nestjs/common entrypoint instead of the internal @nestjs/common/interfaces path, so the published declarations resolve with node16/bundler module resolution on NestJS 12. NestJS 12 requires Node.js >= 20.19 (or >= 22.12).

Patch Changes

• #1327 6c9356d Thanks @juandav! - Security hardening:

  • External stylesheet inlining (<link rel="stylesheet"> in Handlebars/EJS templates) now only reads .css files located inside template.dir (or cssBaseUrl). Previously an absolute or ../ href — including one injected through an unescaped context value — could inline any readable file from the server into the email. The tag matcher also runs in linear time now (it was vulnerable to ReDoS on large rendered output).
  • i18n: locales that are not BCP 47-like tags (e.g. ../../uploads) are ignored and the default locale is used, preventing path traversal through a user-provided locale.
  • textTemplate files must live inside template.dir.
  • Template caches no longer inherit from Object.prototype.
  • Raise the optional peer floors to ejs >= 3.1.10 and pug >= 3.0.3, which fix known template-injection CVEs.

  If you reference stylesheets outside the template directory, set cssBaseUrl to a common parent directory.