typescript-async-await — human mapping

A painting is a person's account of this edit as text, recorded independently of the node mapping - a rendering often has several equally defensible answers where the mapping has one. Deletions and insertions carry no position on the opposite side in a painting, so that panel draws no caret for them.

Before1function fetchData(callback: (data: string) => void): void {
2    setTimeout(() => {
3        callback("Hello, World!");
4    }, 1000);
5}
6
7fetchData((data) => {
8    console.log(data);
9});
10

After1async function fetchData(): Promise<string> {
2    return new Promise((resolve) => {
3        setTimeout(() => {
4            resolve("Hello, World!");
5        }, 1000);
6    });
7}
8
9(async () => {
10    const data = await fetchData();
11    console.log(data);
12})();
13

Before1function fetchData(callback: (data: string) => void): void {
2    setTimeout(() => {
3        callback("Hello, World!");
4    }, 1000);
5}
6
7fetchData((data) => {
8    console.log(data);
9});
10

After1async function fetchData(): Promise<string> {
2    return new Promise((resolve) => {
3        setTimeout(() => {
4            resolve("Hello, World!");
5        }, 1000);
6    });
7}
8
9(async () => {
10    const data = await fetchData();
11    console.log(data);
12})();
13

Before1function fetchData(callback: (data: string) => void): void {
2    setTimeout(() => {
3        callback("Hello, World!");
4    }, 1000);
5}
6
7fetchData((data) => {
8    console.log(data);
9});
10

After1async function fetchData(): Promise<string> {
2    return new Promise((resolve) => {
3        setTimeout(() => {
4            resolve("Hello, World!");
5        }, 1000);
6    });
7}
8
9(async () => {
10    const data = await fetchData();
11    console.log(data);
12})();
13

Before

program

function_declaration

function "function"

identifier "fetchData"

formal_parameters

( "("

required_parameter

identifier "callback"

type_annotation

: ":"

function_type

formal_parameters

( "("

required_parameter

identifier "data"

type_annotation

: ":"

predefined_type

string "string"

) ")"

=> "=>"

predefined_type

void "void"

) ")"

type_annotation

: ":"

predefined_type

void "void"

statement_block

{ "{"

expression_statement

call_expression

identifier "setTimeout"

arguments

( "("

arrow_function

formal_parameters

( "("

) ")"

=> "=>"

statement_block

{ "{"

expression_statement

call_expression

identifier "callback"

arguments

( "("

string

" "\""

string_fragment "Hello, World!"

" "\""

) ")"

; ";"

} "}"

, ","

number "1000"

) ")"

; ";"

} "}"

expression_statement

call_expression

identifier "fetchData"

arguments

( "("

arrow_function

formal_parameters

( "("

required_parameter

identifier "data"

) ")"

=> "=>"

statement_block

{ "{"

expression_statement

call_expression

member_expression

identifier "console"

. "."

property_identifier "log"

arguments

( "("

identifier "data"

) ")"

; ";"

} "}"

) ")"

; ";"

After

program

function_declaration

async "async"

function "function"

identifier "fetchData"

formal_parameters

( "("

) ")"

type_annotation

: ":"

generic_type

type_identifier "Promise"

type_arguments

< "<"

predefined_type

string "string"

> ">"

statement_block

{ "{"

return_statement

return "return"

new_expression

new "new"

identifier "Promise"

arguments

( "("

arrow_function

formal_parameters

( "("

required_parameter

identifier "resolve"

) ")"

=> "=>"

statement_block

{ "{"

expression_statement

call_expression

identifier "setTimeout"

arguments

( "("

arrow_function

formal_parameters

( "("

) ")"

=> "=>"

statement_block

{ "{"

expression_statement

call_expression

identifier "resolve"

arguments

( "("

string

" "\""

string_fragment "Hello, World!"

" "\""

) ")"

; ";"

} "}"

, ","

number "1000"

) ")"

; ";"

} "}"

) ")"

; ";"

} "}"

expression_statement

call_expression

parenthesized_expression

( "("

arrow_function

async "async"

formal_parameters

( "("

) ")"

=> "=>"

statement_block

{ "{"

lexical_declaration

const "const"

variable_declarator

identifier "data"

= "="

await_expression

await "await"

call_expression

identifier "fetchData"

arguments

( "("

) ")"

; ";"

expression_statement

call_expression

member_expression

identifier "console"

. "."

property_identifier "log"

arguments

( "("

identifier "data"

) ")"

; ";"

} "}"

) ")"

arguments

( "("

) ")"

; ";"

Keybindings

j / k: next / previous visible node (tree panels)
h / l: collapse / expand the focused node
g / G: jump to first / last visible node
Tab: switch focus between Before/After panels
/: search: jump to next node whose text contains a given string
a: jump the other panel to this node's mapped counterpart
i: hide identical matches, showing only inserted/deleted/updated nodes and their ancestors
v: cycle the view: split / code only / tree only
p: cycle what the code view renders: the node mapping, then each human painting
r: mark this fixture as reviewed, or forget the mark (kept in this browser only)
n: open a random fixture not yet marked as reviewed
?: toggle this help