experiments.json

This is the template that rush init generates for experiments.json:

common/config/rush/experiments.json

/**
 * This configuration file allows repo maintainers to enable and disable experimental
 * Rush features.  More documentation is available on the Rush website: https://rushjs.io
 */
{
  "$schema": "https://developer.microsoft.com/json-schemas/rush/v5/experiments.schema.json",

  /**
   * By default, 'rush install' passes --no-prefer-frozen-lockfile to 'pnpm install'.
   * Set this option to true to pass '--frozen-lockfile' instead for faster installs.
   */
  // "usePnpmFrozenLockfileForRushInstall": true,

  /**
   * By default, 'rush update' passes --no-prefer-frozen-lockfile to 'pnpm install'.
   * Set this option to true to pass '--prefer-frozen-lockfile' instead to minimize shrinkwrap changes.
   */
  // "usePnpmPreferFrozenLockfileForRushUpdate": true,

  /**
   * By default, 'rush update' runs as a single operation.
   * Set this option to true to instead update the lockfile with `--lockfile-only`, then perform a `--frozen-lockfile` install.
   * Necessary when using the `afterAllResolved` hook in .pnpmfile.cjs.
   */
  // "usePnpmLockfileOnlyThenFrozenLockfileForRushUpdate": true,

  /**
   * If using the 'preventManualShrinkwrapChanges' option, restricts the hash to only include the layout of external dependencies.
   * Used to allow links between workspace projects or the addition/removal of references to existing dependency versions to not
   * cause hash changes.
   */
  // "omitImportersFromPreventManualShrinkwrapChanges": true,

  /**
   * If true, the chmod field in temporary project tar headers will not be normalized.
   * This normalization can help ensure consistent tarball integrity across platforms.
   */
  // "noChmodFieldInTarHeaderNormalization": true,

  /**
   * If true, build caching will respect the allowWarningsInSuccessfulBuild flag and cache builds with warnings.
   * This will not replay warnings from the cached build.
   */
  // "buildCacheWithAllowWarningsInSuccessfulBuild": true,

  /**
   * If true, build skipping will respect the allowWarningsInSuccessfulBuild flag and skip builds with warnings.
   * This will not replay warnings from the skipped build.
   */
  // "buildSkipWithAllowWarningsInSuccessfulBuild": true,

  /**
   * If true, the phased commands feature is enabled. To use this feature, create a "phased" command
   * in common/config/rush/command-line.json.
   */
  // "phasedCommands": true,

  /**
   * If true, perform a clean install after when running `rush install` or `rush update` if the
   * `.npmrc` file has changed since the last install.
   */
  // "cleanInstallAfterNpmrcChanges": true,

  /**
   * If true, print the outputs of shell commands defined in event hooks to the console.
   */
  // "printEventHooksOutputToConsole": true,

  /**
   * If true, Rush will not allow node_modules in the repo folder or in parent folders.
   */
  // "forbidPhantomResolvableNodeModulesFolders": true,

  /**
   * (UNDER DEVELOPMENT) For certain installation problems involving peer dependencies, PNPM cannot
   * correctly satisfy versioning requirements without installing duplicate copies of a package inside the
   * node_modules folder. This poses a problem for "workspace:*" dependencies, as they are normally
   * installed by making a symlink to the local project source folder. PNPM's "injected dependencies"
   * feature provides a model for copying the local project folder into node_modules, however copying
   * must occur AFTER the dependency project is built and BEFORE the consuming project starts to build.
   * The "pnpm-sync" tool manages this operation; see its documentation for details.
   * Enable this experiment if you want "rush" and "rushx" commands to resync injected dependencies
   * by invoking "pnpm-sync" during the build.
   */
  // "usePnpmSyncForInjectedDependencies": true,

  /**
   * If set to true, Rush will generate a `project-impact-graph.yaml` file in the repository root during `rush update`.
   */
  // "generateProjectImpactGraphDuringRushUpdate": true,
  /**
   * If true, when running in watch mode, Rush will check for phase scripts named `_phase:<name>:ipc` and run them instead
   * of `_phase:<name>` if they exist. The created child process will be provided with an IPC channel and expected to persist
   * across invocations.
   */
  // "useIPCScriptsInWatchMode": true
}