Zod Conditional Validation based on fetched data

I am fetching tsmin, tsmax values from get api. I have defined a zod schema with gte validation.

  const tsmin = Number(getMinMechProp("tensilestrength"));
  const tsmax = Number(getMaxMechProp("tensilestrength"));

 const mechPropSchema = z.object({
   tensilestrength: z.coerce.number()
      .gte(tsmin, `Value must be at least ${tsmin}`),
});

Now I want to apply zod lte validation only if tsmax > 0.

I didn't got the best way to achieve this

A zod schema is an ordinary object. You can use all the normal ways of choosing between objects.

You can use an extra variable and a condition:

let tsschema = z.coerce.number().gte(tsmin, `Value must be at least ${tsmin}`);
if (tsmax > 0) {
    tsschema = tsschema.lte(tsmax, `Value must be at most ${tsmax}`);
}
const mechPropSchema = z.object({
    tensilestrength: tsschema,
});

You can use ?::

const mechPropSchema = z.object({
    tensilestrength: (tsmax > 0) ? z.coerce.number().gte(tsmin, `Value must be at least ${tsmin}`).lte(tsmax, `Value must be at most ${tsmax}`) : z.coerce.number().gte(tsmin, `Value must be at least ${tsmin}`),
});

You can extract that to a function:

function tsschema(tsmin, tsmax) {
    const schema = z.coerce.number().gte(tsmin, `Value must be at least ${tsmin}`);
    return (tsmax > 0) ? schema.lte(tsmax, `Value must be at most ${tsmax}`) : schema;
}

const mechPropSchema = z.object({
    tensilestrength: tsschema(tsmin, tsmax),
});