swc/crates/swc_ecma_parser/tests/tsc/stringLiteralsWithEqualityChecks01.ts

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let x: "foo";
let y: "foo" | "bar";
let b: boolean;
b = x === y;
b = "foo" === y
b = y === "foo";
b = "foo" === "bar";
b = "bar" === x;
b = x === "bar";
b = y === "bar";
b = "bar" === y;
b = x !== y;
b = "foo" !== y
b = y !== "foo";
b = "foo" !== "bar";
b = "bar" !== x;
b = x !== "bar";
b = y !== "bar";
b = "bar" !== y;