============================================
Assignments
============================================

a = 0;
var b = 0;
const c = 0;
let d = 0;

---

(program
  (expression_statement
    (assignment_expression
      (identifier)
      (number)))
  (variable_declaration
    (variable_declarator
      (identifier)
      (number)))
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number)))
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number))))

============================================
'undefined' is a variable
============================================

undefined = 42;
var undefined = 42;
const undefined = 42;
let undefined = 42;

---

(program
  (expression_statement
    (assignment_expression
      (undefined)
      (number)))
  (variable_declaration
    (variable_declarator
      (identifier)
      (number)))
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number)))
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number))))

============================================
Imports
============================================

import defaultMember from "module-name";
import * as name from "module-name";
import { member } from "module-name";
import { member1 , member2 } from "module-name";
import { member1 , member2 as alias2 } from "module-name";
import { "string name" as alias } from "module-name";
import defaultMember, { member1, member2 as alias2 } from "module-name";
import defaultMember, * as name from "module-name";
import "module-name";
import { member1 , member2 as alias2, } from "module-name";
import("a");
import("a").then((m) => {});
import.meta.url;

----

(program
  (import_statement
    (import_clause
      (identifier))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (namespace_import
        (identifier)))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (named_imports
        (import_specifier
          (identifier))))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (named_imports
        (import_specifier
          (identifier))
        (import_specifier
          (identifier))))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (named_imports
        (import_specifier
          (identifier))
        (import_specifier
          (identifier)
          (identifier))))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (named_imports
        (import_specifier
          (string
            (string_fragment))
          (identifier))))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (identifier)
      (named_imports
        (import_specifier
          (identifier))
        (import_specifier
          (identifier)
          (identifier))))
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (identifier)
      (namespace_import
        (identifier)))
    (string
      (string_fragment)))
  (import_statement
    (string
      (string_fragment)))
  (import_statement
    (import_clause
      (named_imports
        (import_specifier
          (identifier))
        (import_specifier
          (identifier)
          (identifier))))
    (string
      (string_fragment)))
  (expression_statement
    (call_expression
      (import)
      (arguments
        (string
          (string_fragment)))))
  (expression_statement
    (call_expression
      (member_expression
        (call_expression
          (import)
          (arguments
            (string
              (string_fragment))))
        (property_identifier))
      (arguments
        (arrow_function
          (formal_parameters
            (identifier))
          (statement_block)))))
  (expression_statement
    (member_expression
      (member_expression
        (import)
        (property_identifier))
      (property_identifier))))

============================================
Exports
============================================

export { name1, name2, name3, nameN };
export { variable1 as name1, variable2 as name2, nameN };
export { variable1 as "string name" };
export let name1, name2, nameN;
export let name1 = value1, name2 = value2, name3, nameN;

export default expression;
export default { field1: 42, field2: [] }
export default function () { }
export default function name1() { }
export { name1 as default };

export * from 'foo';
export * as someIdentifier from "someModule";
export * as "string name" from "someModule";
export { name1, name2, nameN } from 'foo';
export { import1 as name1, import2 as name2, nameN } from 'foo';
export { import1 as "string name" } from 'foo';
export { "string import" as "string export" } from 'foo';

----

(program
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier))
      (export_specifier
        name: (identifier))
      (export_specifier
        name: (identifier))
      (export_specifier
        name: (identifier))))
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier)
        alias: (identifier))
      (export_specifier
        name: (identifier)
        alias: (identifier))
      (export_specifier
        name: (identifier))))
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier)
        alias: (string
          (string_fragment)))))
  (export_statement
    declaration: (lexical_declaration
      (variable_declarator
        name: (identifier))
      (variable_declarator
        name: (identifier))
      (variable_declarator
        name: (identifier))))
  (export_statement
    declaration: (lexical_declaration
      (variable_declarator
        name: (identifier)
        value: (identifier))
      (variable_declarator
        name: (identifier)
        value: (identifier))
      (variable_declarator
        name: (identifier))
      (variable_declarator
        name: (identifier))))
  (export_statement
    value: (identifier))
  (export_statement
    value: (object
      (pair
        key: (property_identifier)
        value: (number))
      (pair
        key: (property_identifier)
        value: (array))))
  (export_statement
    value: (function
      parameters: (formal_parameters)
      body: (statement_block)))
  (export_statement
    declaration: (function_declaration
      name: (identifier)
      parameters: (formal_parameters)
      body: (statement_block)))
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier)
        alias: (identifier))))
  (export_statement
    source: (string
      (string_fragment)))
  (export_statement
    (namespace_export
      (identifier))
    source: (string
      (string_fragment)))
  (export_statement
    (namespace_export
      (string
        (string_fragment)))
    source: (string
      (string_fragment)))
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier))
      (export_specifier
        name: (identifier))
      (export_specifier
        name: (identifier)))
    source: (string
      (string_fragment)))
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier)
        alias: (identifier))
      (export_specifier
        name: (identifier)
        alias: (identifier))
      (export_specifier
        name: (identifier)))
    source: (string
      (string_fragment)))
  (export_statement
    (export_clause
      (export_specifier
        name: (identifier)
        alias: (string
          (string_fragment))))
    source: (string
      (string_fragment)))
  (export_statement
    (export_clause
      (export_specifier
        name: (string
          (string_fragment))
        alias: (string
          (string_fragment))))
    source: (string
      (string_fragment))))

============================================
Decorators before exports
============================================

@injectable()
export class Foo {
}

---

(program
  (export_statement
    decorator: (decorator
      (call_expression
        function: (identifier)
        arguments: (arguments)))
    declaration: (class_declaration
      name: (identifier)
      body: (class_body))))

============================================
If statements
============================================

if (x)
  log(y);

if (a.b) {
  log(c);
  d;
}

----

(program
  (if_statement
    condition: (parenthesized_expression
      (identifier))
    consequence: (expression_statement
      (call_expression
        function: (identifier)
        arguments: (arguments
          (identifier)))))
  (if_statement
    condition: (parenthesized_expression
      (member_expression
        object: (identifier)
        property: (property_identifier)))
    consequence: (statement_block
      (expression_statement
        (call_expression
          function: (identifier)
          arguments: (arguments
            (identifier))))
      (expression_statement
        (identifier)))))

============================================
If-else statements
============================================

if (x)
  y;
else if (a)
  b;

if (a) {
  c;
  d;
} else {
  e;
}

----

(program
  (if_statement
    condition: (parenthesized_expression
      (identifier))
    consequence: (expression_statement
      (identifier))
    alternative: (else_clause
      (if_statement
        condition: (parenthesized_expression
          (identifier))
        consequence: (expression_statement
          (identifier)))))
  (if_statement
    condition: (parenthesized_expression
      (identifier))
    consequence: (statement_block
      (expression_statement
        (identifier))
      (expression_statement
        (identifier)))
    alternative: (else_clause
      (statement_block
        (expression_statement
          (identifier))))))

============================================
For statements
============================================

for (var a, b; c; d)
  e;

for (i = 0, init(); i < 10; i++)
  log(y);

for (;;) {
  z;
  continue;
}

for (var i = 0
  ; i < l
  ; i++) {
}

---

(program
  (for_statement
    initializer: (variable_declaration
      (variable_declarator
        name: (identifier))
      (variable_declarator
        name: (identifier)))
    condition: (expression_statement
      (identifier))
    increment: (identifier)
    body: (expression_statement
      (identifier)))
  (for_statement
    initializer: (expression_statement
      (sequence_expression
        left: (assignment_expression
          left: (identifier)
          right: (number))
        right: (call_expression
          function: (identifier)
          arguments: (arguments))))
    condition: (expression_statement
      (binary_expression
        left: (identifier)
        right: (number)))
    increment: (update_expression
      argument: (identifier))
    body: (expression_statement
      (call_expression
        function: (identifier)
        arguments: (arguments
          (identifier)))))
  (for_statement
    initializer: (empty_statement)
    condition: (empty_statement)
    body: (statement_block
      (expression_statement
        (identifier))
      (continue_statement)))
  (for_statement
    initializer: (variable_declaration
      (variable_declarator
        name: (identifier)
        value: (number)))
    condition: (expression_statement
      (binary_expression
        left: (identifier)
        right: (identifier)))
    increment: (update_expression
      argument: (identifier))
    body: (statement_block)))

============================================
For-in statements
============================================

for (item in items)
  item();

for (var item in items || {})
  item();

for (const {thing} in things)
  thing();

for (x in a, b, c)
  foo();

for (x[i] in a) {}

for (x.y in a) {}

for ([a, b] in c) {}

for ((a) in b) {}

for (var foo = bar in baz) {}

---

(program
  (for_in_statement
    (identifier)
    (identifier)
    (expression_statement
      (call_expression
        (identifier)
        (arguments))))
  (for_in_statement
    (identifier)
    (binary_expression
      (identifier)
      (object))
    (expression_statement
      (call_expression
        (identifier)
        (arguments))))
  (for_in_statement
    (object_pattern
      (shorthand_property_identifier_pattern))
    (identifier)
    (expression_statement
      (call_expression
        (identifier)
        (arguments))))
  (for_in_statement
    (identifier)
    (sequence_expression
      (identifier)
      (sequence_expression
        (identifier)
        (identifier)))
    (expression_statement
      (call_expression
        (identifier)
        (arguments))))
  (for_in_statement
    (subscript_expression
      (identifier)
      (identifier))
    (identifier)
    (statement_block))
  (for_in_statement
    (member_expression
      (identifier)
      (property_identifier))
    (identifier)
    (statement_block))
  (for_in_statement
    (array_pattern
      (identifier)
      (identifier))
    (identifier)
    (statement_block))
  (for_in_statement
    (parenthesized_expression
      (identifier))
    (identifier)
    (statement_block))
  (for_in_statement
    (identifier)
    (identifier)
    (identifier)
    (statement_block)))

==========================================
For loops beginning with an in-expression
==========================================

for (key in something && i = 0; i < n; i++) {
  doSomething();
}

---

(program
  (for_statement
    (expression_statement
      (binary_expression
        (binary_expression
          (identifier)
          (identifier))
        (assignment_expression
          (identifier)
          (number))))
    (expression_statement
      (binary_expression
        (identifier)
        (identifier)))
    (update_expression
      (identifier))
    (statement_block
      (expression_statement
        (call_expression
          (identifier)
          (arguments))))))

============================================
For-of statements
============================================

for (a of b)
  process(a);

for (let {a, b} of items || [])
  process(a, b);

---

(program
  (for_in_statement
    (identifier)
    (identifier)
    (expression_statement
      (call_expression
        (identifier)
        (arguments
          (identifier)))))
  (for_in_statement
    (object_pattern
      (shorthand_property_identifier_pattern)
      (shorthand_property_identifier_pattern))
    (binary_expression
      (identifier)
      (array))
    (expression_statement
      (call_expression
        (identifier)
        (arguments
          (identifier)
          (identifier))))))

============================================
For-await-of statements
============================================

for await (const chunk of stream) {
  str += chunk;
}

---

(program
  (for_in_statement
    (identifier)
    (identifier)
    (statement_block
      (expression_statement
        (augmented_assignment_expression
          (identifier)
          (identifier))))))

============================================
While statements
============================================

while (a)
  b();

while (a) {

}

---

(program
  (while_statement
    condition: (parenthesized_expression
      (identifier))
    body: (expression_statement
      (call_expression
        function: (identifier)
        arguments: (arguments))))
  (while_statement
    condition: (parenthesized_expression
      (identifier))
    body: (statement_block)))

============================================
Do statements
============================================

do {
  a;
} while (b)

do a; while (b)

do {} while (b)

do do; while (a) while (a)

for (a in b) { do ; while (a) break; }

---

(program
  (do_statement
    body: (statement_block
      (expression_statement
        (identifier)))
    condition: (parenthesized_expression
      (identifier)))
  (do_statement
    body: (expression_statement
      (identifier))
    condition: (parenthesized_expression
      (identifier)))
  (do_statement
    body: (statement_block)
    condition: (parenthesized_expression
      (identifier)))
  (do_statement
    body: (do_statement
      body: (empty_statement)
      condition: (parenthesized_expression
        (identifier)))
    condition: (parenthesized_expression
      (identifier)))
  (for_in_statement
    left: (identifier)
    right: (identifier)
    body: (statement_block
      (do_statement
        body: (empty_statement)
        condition: (parenthesized_expression
          (identifier)))
      (break_statement))))

============================================
Return statements
============================================

return;
return 5;
return 1,2;
return async;
return a;

---

(program
  (return_statement)
  (return_statement
    (number))
  (return_statement
    (sequence_expression
      (number)
      (number)))
  (return_statement
    (identifier))
  (return_statement
    (identifier)))

============================================
Variable declarations
============================================

var x = 1;
var x, y = {}, z;

---

(program
  (variable_declaration
    (variable_declarator
      (identifier)
      (number)))
  (variable_declaration
    (variable_declarator
      (identifier))
    (variable_declarator
      (identifier)
      (object))
    (variable_declarator
      (identifier))))

============================================
Comments
============================================

{

  // This is a property
  aProperty: 1,

  /*
   * This is a method
   */
  aMethod: function() {}
};

---

(program
  (expression_statement
    (object
      (comment)
      (pair
        (property_identifier)
        (number))
      (comment)
      (pair
        (property_identifier)
        (function
          (formal_parameters)
          (statement_block))))))

==========================================
Comments between statements
==========================================

// this is the beginning of the script.
// here we go.
var thing = {

  // this is a property.
  // its value is a function.
  key: function(x /* this is a parameter */) {
    // this is one statement
    one();
    // this is another statement
    two();
  }
};

---

(program
  (comment)
  (comment)
  (variable_declaration
    (variable_declarator
      (identifier)
      (object
        (comment)
        (comment)
        (pair
          (property_identifier)
          (function
            (formal_parameters
              (identifier)
              (comment))
            (statement_block
              (comment)
              (expression_statement
                (call_expression
                  (identifier)
                  (arguments)))
              (comment)
              (expression_statement
                (call_expression
                  (identifier)
                  (arguments))))))))))

============================================
Comments with asterisks
============================================

/* a */
const a = 1;

/* b **/
const b = 1;

/* c ***/
const c = 1;

/* d

***/
const d = 1;

---

(program
  (comment)
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number)))
  (comment)
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number)))
  (comment)
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number)))
  (comment)
  (lexical_declaration
    (variable_declarator
      (identifier)
      (number))))

==========================================
Comments within expressions
==========================================

y // comment
  * z;

---

(program
  (expression_statement
    (binary_expression
      (identifier)
      (comment)
      (identifier))))

==========================================
HTML Comments
==========================================

<!-- we can put whatever we like here. this affects one line only.
y * z;
<!-- and here as well. these do not have to have matching close comments.

x + 1; --> for some reason you can put text after a close comment.

--> note that the x + 1 above should be rejected according to the spec.
--> it should instead be rejected as invalid.
--> you are supposed to only have whitespace or comments before
--> an HTML close comment.

---

(program
  (comment)
  (expression_statement
    (binary_expression
      (identifier)
      (identifier)))
  (comment)
  (expression_statement
    (binary_expression
      (identifier)
      (number)))
  (comment)
  (comment)
  (comment)
  (comment)
  (comment))

============================================
Switch statements
============================================

switch (x) {
  case 1:
  case 2:
    something();
    break;
  case "three":
    somethingElse();
    break;
  default:
    return 4;
}

---

(program
  (switch_statement
    (parenthesized_expression
      (identifier))
    (switch_body
      (switch_case
        (number))
      (switch_case
        (number)
        (expression_statement
          (call_expression
            (identifier)
            (arguments)))
        (break_statement))
      (switch_case
        (string
          (string_fragment))
        (expression_statement
          (call_expression
            (identifier)
            (arguments)))
        (break_statement))
      (switch_default
        (return_statement
          (number))))))

============================================
Throw statements
============================================

throw new Error("uh oh");

---

(program
  (throw_statement
    (new_expression
      (identifier)
      (arguments
        (string
          (string_fragment))))))

============================================
Throw statements with sequence expressions
============================================

throw f = 1, f;
throw g = 2, g
---

(program
  (throw_statement
    (sequence_expression
      (assignment_expression
        (identifier)
        (number))
      (identifier)))
  (throw_statement
    (sequence_expression
      (assignment_expression
        (identifier)
        (number))
      (identifier))))

============================================
Try catch finally statements
============================================

try { a; } catch (b) { c; }
try { d; } finally { e; }
try { f; } catch { g; } finally { h; }
try { throw [a, b] } catch ([c, d]) { }

---

(program
  (try_statement
    (statement_block
      (expression_statement
        (identifier)))
    (catch_clause
      (identifier)
      (statement_block
        (expression_statement
          (identifier)))))
  (try_statement
    (statement_block
      (expression_statement
        (identifier)))
    (finally_clause
      (statement_block
        (expression_statement
          (identifier)))))
  (try_statement
    (statement_block
      (expression_statement
        (identifier)))
    (catch_clause
      (statement_block
        (expression_statement
          (identifier))))
    (finally_clause
      (statement_block
        (expression_statement
          (identifier)))))
  (try_statement
    (statement_block
      (throw_statement
        (array
          (identifier)
          (identifier))))
    (catch_clause
      (array_pattern
        (identifier)
        (identifier))
      (statement_block))))

============================================
Empty statements
============================================

if (true) { ; };;;
if (true) {} else {}

---

(program
  (if_statement
    (parenthesized_expression
      (true))
    (statement_block
      (empty_statement)))
  (empty_statement)
  (empty_statement)
  (empty_statement)
  (if_statement
    (parenthesized_expression
      (true))
    (statement_block)
    (else_clause
      (statement_block))))

============================================
Labeled statements
============================================

theLoop:
for (;;) {
  if (a) {
    break theLoop;
  } else {
    continue theLoop;
  }
}

label
: {
  break label;
}

async:
while (true) {
  continue async;
}

---

(program
  (labeled_statement
    label: (statement_identifier)
    body: (for_statement
      initializer: (empty_statement)
      condition: (empty_statement)
      body: (statement_block
        (if_statement
          condition: (parenthesized_expression
            (identifier))
          consequence: (statement_block
            (break_statement
              label: (statement_identifier)))
          alternative: (else_clause
            (statement_block
              (continue_statement
                label: (statement_identifier))))))))
  (labeled_statement
    label: (statement_identifier)
    body: (statement_block
      (break_statement
        label: (statement_identifier))))
  (labeled_statement
    label: (statement_identifier)
    body: (while_statement
      condition: (parenthesized_expression
        (true))
      body: (statement_block
        (continue_statement
          label: (statement_identifier))))))

============================================
Debugger statements
============================================

debugger;
debugger

---

(program
  (debugger_statement)
  (debugger_statement))

============================================
With statements
============================================

with (x) { i; }

with (x) { }

---

(program
  (with_statement
    object: (parenthesized_expression
      (identifier))
    body: (statement_block
      (expression_statement
        (identifier))))
  (with_statement
    object: (parenthesized_expression
      (identifier))
    body: (statement_block)))

==========================================
Hash bang lines
==========================================

#!/usr/bin/env node

console.log("HI")

---

(program
  (hash_bang_line)
  (expression_statement
    (call_expression
      (member_expression
        (identifier)
        (property_identifier))
      (arguments
        (string
          (string_fragment))))))