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StrictNullCheck incorrectly prevents the use of the indexed access operator #20141

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StrictNullCheck incorrectly prevents the use of the indexed access operator#20141
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Description

@RainingChain
Samuel Magnan (RainingChain)
opened on Nov 19, 2017

TypeScript Version: 2.6.1

Code

class Klass {
  prop1:{innerNumber:number} | null;
  setInnerNumber(newInnerNumber:Klass['prop1']['innerNumber']){
    this.prop1 = {innerNumber:newInnerNumber}
  }
}
//Compile with --strictNullCheck

Expected behavior:
No error.

Actual behavior:
Property innerNumber does not exist on type '{ innerNumber:number;} | null'

Strict null check should not be checked for indexed access operator.

Activity

  2. ghost marked this as a duplicate of Non-null assertion type operator ! #14366 on Nov 19, 2017
  3. ghost added
    DuplicateAn existing issue was already created
    on Nov 19, 2017

  4. typescript-bot commented on Dec 4, 2017

    @typescript-bot
    TypeScript Bot (typescript-bot)
    on Dec 4, 2017
    Contributor

    Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.

  5. TypeScript Bot (typescript-bot)
    closed this as completedon Dec 4, 2017

  6. mhegazy commented on Mar 2, 2018

    @mhegazy
    Mohamed Hegazy (mhegazy)
    on Mar 2, 2018
    Contributor

    This should be doable today using NonNullable type

  7. microsoft
    locked and limited conversation to collaborators on Jul 3, 2018
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