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docs: clarify a possible error case #40828

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docs: clarify a possible error case #40828

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docs: clarify a possible error case
ynden Feb 12, 2021
53955da
replace contact by hero
ynden Feb 12, 2021
e063b23
Add link for information
ynden Feb 12, 2021
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8 changes: 8 additions & 0 deletions aio/content/tutorial/toh-pt3.md
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Expand Up @@ -81,6 +81,14 @@ That's the only change you should make to the `HeroDetailComponent` class.
There are no more properties. There's no presentation logic.
This component simply receives a hero object through its `hero` property and displays it.

You may get this error: `Property 'hero' has no initializer and is not definitely assigned in the constructor.ts(2564)`.
It is likely that you use a version of Typescript >= 2.7. To resolve this, simply put an exclamation mark after the variable name like this:
```ts
@Input() hero!: Hero;
```
More information [here](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-7.html#strict-class-initialization).


## Show the `HeroDetailComponent`

The `HeroesComponent` is still a master/detail view.
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