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Argument of type 'this' is not assignable to parameter of type 'NonNullable'?
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**TypeScript Version:** 4.0.3
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:** 'this' is not assignable to 'NonNullable'
**Code**
```ts
abstract class TreeNode {
parent: this | null = null; // polymorph this
left: this | null = null;
right: this | null = null;
replaceChild(child: this, replacement: this | null = null) { // this - polymorph type
this.left = child;
this.right = replacement;
}
removeNode() {
this.parent?.replaceChild(this, null); // ERROR
}
removeNode2Way() {
if (this.parent) {
this.parent.replaceChild(this, null); // OK
}
}
}
```
**Expected behavior:**
Conditional call without errors.
**Actual behavior:**
Error: Argument of type 'this' is not assignable to parameter of type 'NonNullable'
**Playground Link:** [Playground](https://www.typescriptlang.org/play?ts=4.0.3#code/IYIwzgLgTsDGEAJYBthjAgKlApjgcgPYAmOCA3gFAIIAOwuAdhAFwIQAWAlhgD4KMArsmQIAvAOHIA3AgD0c9twxo6hZAE8AtoSi0O7DbRzUEyHADNWSngn5CR4ySOmmoXAOYdrnW-alODjKUbji0qLA4AMLcyMQAFLCxxGy+YAA0CLjhcDhaOMypynbOohJBAJQUpjRpAHTmVk5JXHGyCjYqGLCCUEyIXIyQwIyRNZ117l6IEtkReQUQrjQAviE0uDoAbgQkOPFVVDS1ynX0-QD8k2HzMa0JaZmVywhrodu7pABMAOrAGgdqjQuBZ4vVzotDuNwQxFtccpE7n…
接入你的 Agent 之后,它会调用 POST /api/v1/claims 带上 3068 完成认领。
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