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I have tried to implement strictNullChecks in angular 4 application.
I have just added "strictNullChecks": true in tsconfig.json
When I run the application ng serve I got this below error.
ERROR in [at-loader] ./node_modules/@angular/forms/src/model.d.ts:244:39
TS2459: Type '{ onlySelf?: boolean | undefined; emitEvent?: boolean |
undefined; } | undefined' has no property 'emitEvent' and no string index signature.
What's going wrong? How can we implement
strictNullChecksin angular 4?
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To enable StrictNullChecks open tsconfg. sys and add "strictNullChecks": true under the compilerOptions . With this set to true , you'll get a type error if you try to use null or undefined wherever Typescript expects a concrete type.
To opt into the strict mode, you need to create a new Angular CLI app, specifying the --strict flag: The command above will generate a workspace with the following settings enabled on top of the defaults: Strict mode in TypeScript, as well as other strictness flags recommended by the TypeScript team.
In Typescript to enforce strict null checks in tsconfig. json file, we need to enable “strictNullChecks” to true. When “strictNullChecks” is false, the language generally ignores variables of type null and undefined. If null and undefined is used in places where a definite value is expected, it raises an error.
--strictNullChecks strictNullChecks switches to a new strict null checking mode. In strict null checking mode, the null and undefined values are not in the domain of every type and are only assignable to themselves and any (the one exception being that undefined is also assignable to void ).
When you enable strictNullChecks, it enables it for all TypeScript files, which includes libraries.
To enable strictNullChecks in an Angular CLI project set skipLibCheck to true in your tsConfig.
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