angular/aio/content/errors/NG0209.md

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@name Invalid multi provider
@category runtime
@shortDescription Expected provider to be `multi: true` but did not get an Array
@description
The Angular runtime will throw this error when it injects a token intended to be used with `multi: true` but
a non-Array was found instead. For example, `ENVIRONMENT_INITIALIZER` should be provided
like `{provide: ENVIRONMENT_INITIALIZER, multi: true, useValue: () => {...}}`.
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@reviewed 2022-11-28