Type script tuple type

// Declare a tuple type
let x: [string, number];
// Initialize it
x = ["hello", 10]; // OK
// Initialize it incorrectly
x = [10, "hello"]; // Error
Type 'number' is not assignable to type 'string'.Type 'string' is not assignable to type 'number'.23222322Type 'number' is not assignable to type 'string'.Type 'string' is not assignable to type 'number'.Try

Source: typescriptlang.org

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