read through typescript variable declarations

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#variable-declarations

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#var-declarations

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#scoping-rules

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#variable-capturing-quirks

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#let-declarations

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#block-scoping

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#re-declarations-and-shadowing

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#block-scoped-variable-capturing

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#const-declarations

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#let-vs-const

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#destructuring

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#array-destructuring

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#tuple-destructuring

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#object-destructuring

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#property-renaming

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#default-values

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finished: https://www.typescriptlang.org/docs/handbook/variable-declarations.html#function-declarations