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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Scope sharing tests</title>
</head>
<body>
<script>
function expect(fn) {
try {
if (fn() === false) console.error(`${fn} returned false`)
console.log(`${fn} succeeded`)
}
catch (e) {
console.error(`${fn} threw ${e}`)
}
}
function expectThrows(fn, expectedException) {
try {
fn()
console.error(`${fn} didn't threw ${expectedException.name}`)
}
catch (e) {
if (e instanceof expectedException) {
console.log(`${fn} expectedly threw ${expectedException.name}`)
}
else {
console.log(`${fn} threw ${e} instead of ${expectedException.name}`)
}
}
}
</script>
<script>
var varGloballyDeclared = 1
let letGloballyDeclared = 1
function functionGloballyDeclared() {}
class ClassGloballyDeclared {}
console.group("Declarations are not hoisted to previous scripts")
expectThrows(() => varNotYetGloballyDeclared, ReferenceError)
expectThrows(() => letNotYetGloballyDeclared, ReferenceError)
expectThrows(() => functionNotYetGloballyDeclared, ReferenceError)
expectThrows(() => ClassNotYetGloballyDeclared, ReferenceError)
console.groupEnd()
</script>
<script>
var varNotYetGloballyDeclared = 2
let letNotYetGloballyDeclared = 2
function functionNotYetGloballyDeclared() {}
class ClassNotYetGloballyDeclared {}
console.group("Standard scripts are using the global scope")
expect(() => varGloballyDeclared === 1)
expect(() => letGloballyDeclared === 1)
expect(() => Boolean(functionGloballyDeclared))
expect(() => Boolean(ClassGloballyDeclared))
console.groupEnd()
</script>
<script type="module">
var varModuleDeclared = 3
console.group("Modules are using the global scope")
expect(() => varGloballyDeclared === 1)
expect(() => Boolean(functionGloballyDeclared))
console.groupEnd()
</script>
<script type="module">
console.group("Modules are not sharing their scope")
expectThrows(() => varModuleDeclared, ReferenceError)
console.groupEnd()
</script>
<script>
console.group("Modules are not exporting declarations to the global scope")
expectThrows(() => varModuleDeclared, ReferenceError)
console.groupEnd()
</script>
</body>
</html>
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