How to make Input field as Array of string

[2717akansha]

In form step component, I want to change it to array of string but when I interface
export type MyForm = {
input1: string[];
};
and assign value to data
if (this.chipInput.trim()) {
this.chips.push(this.chipInput.trim());
this.data = this.chips;
this.chipInput = '';
}
getting error
Property 'input1' is missing in type 'string[]' but required in type 'MyForm'.ts(2741)
form-step.component.ts(5, 3): 'input1' is declared here.