Remove empty lines of a text document

JavaScript version
const removeEmptyLines = (str) =>
str
.split(/\r?\n/)
.filter((line) => line.trim() !== '')
.join('\n');
TypeScript version
const removeEmptyLines = (str: string): string =>
str
.split(/\r?\n/)
.filter((line) => line.trim() !== '')
.join('\n');
Examples
removeEmptyLines(`red
green
blue
yellow`);
/* Output */
/*
red
green
blue
yellow
*/