De l'ECMAScript au TypeScript
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$ tsc customer.ts
customer.ts(11,18): error TS2339: Property 'firstName' does not exist on type 'Customer'.
customer.ts(12,18): error TS2339: Property 'lastName' does not exist on type 'Customer'.class Customer {
firstName;
lastName;
constructor(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
}