prettier/tests/flow/dictionary/__snapshots__/jsfmt.spec.js.snap

// Jest Snapshot v1, https://goo.gl/fbAQLP

exports[`any.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
/* @flow */

const dict: {[key: string]: number} = {}
const k: any = 'foo'
const val: string = dict[k] // error: number incompatible with string

=====================================output=====================================
/* @flow */

const dict: { [key: string]: number } = {};
const k: any = "foo";
const val: string = dict[k]; // error: number incompatible with string

================================================================================
`;

exports[`compatible.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
/* @flow */

function foo0(x: Array<{[key: string]: mixed}>): Array<{[key: string]: mixed}> {
  // this adds a fooBar property to the param type, which should NOT cause
  // an error in the return type because it is a dictionary.
  x[0].fooBar = 'foobar';
  return x;
}

function foo2(
  x: {[key: string]: number}
): {[key: string]: number, +toString: () => string} {
  // x's prototype has a toString method
  return x;
}

=====================================output=====================================
/* @flow */

function foo0(
  x: Array<{ [key: string]: mixed }>
): Array<{ [key: string]: mixed }> {
  // this adds a fooBar property to the param type, which should NOT cause
  // an error in the return type because it is a dictionary.
  x[0].fooBar = "foobar";
  return x;
}

function foo2(x: {
  [key: string]: number
}): { [key: string]: number, +toString: () => string } {
  // x's prototype has a toString method
  return x;
}

================================================================================
`;

exports[`dictionary.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
/* Dictionary types are object types that include an indexer, which specifies a
 * key type and a value type. The presence of an indexer makes the object type
 * unsealed, but all added properties must be consistent with the indexer
 * signature.
 *
 * Dictionaries can be used to represent the common idiom of objects used as
 * maps. They can also be used to represent array-like objects, e.g., NodeList
 * from the DOM API.
 *
 * A dictionary is assumed to have every property described by it's key type.
 * This behavior is similar to the behavior of arrays, which are assumed to have
 * a value at every index.
 *
 * @flow
 */

// Some logic is variance-sensitive.
class A {}
class B extends A {}
class C extends B {}

// Just a couple of short type names. Compare to string/number.
class X {}
class Y {}

// Any property can be set on a dict with string keys.
function set_prop_to_string_key(
  o: {[k:string]:any},
) {
  o.prop = "ok";
}

// **UNSOUND**
// This is allowed by design. We don't track get/set and we don't wrap the
// return type in a maybe.
function unsound_dict_has_every_key(
  o: {[k:string]:X},
) {
  (o.p: X); // ok
  (o["p"]: X); // ok
}

// As with any object type, we can assign subtypes to properties.
function set_prop_covariant(
  o: {[k:string]:B},
) {
  o.p = new A; // error, A ~> B
  o.p = new B; // ok
  o.p = new C; // ok
}

// This isn't specific behavior to dictionaries, but for completeness...
function get_prop_contravariant(
  o: {[k:string]:B},
) {
  (o.p: A); // ok
  (o.p: B); // ok
  (o.p: C); // error, C ~> B
}

// Dot-notation can not be used to add properties to dictionaries with
// non-string keys, because keys are strings.
function add_prop_to_nonstring_key_dot(
  o: {[k:number]:any},
) {
  o.prop = "err"; // error: string ~> number
}

// Bracket notation can be used to add properties to dictionaries with
// non-string keys, even though all keys are strings. This is a convenient
// affordance.
function add_prop_to_nonstring_key_bracket(
  o: {[k:number]:any},
) {
  o[0] = "ok";
}

// Objects can be part dict, part not by mixing an indexer with declared props.
function mix_with_declared_props(
  o: {[k:number]:X,p:Y},
  x: X,
  y: Y,
) {
  (o[0]: X); // ok
  (o.p: Y); // ok
  o[0] = x; // ok
  o.p = y; // ok
}

// Indeed, dict types are still Objects and have Object.prototype stuff
function object_prototype(
  o: {[k:string]:number},
): {[k:string]:number, +toString: () => string} {
  (o.toString(): boolean); // error: string ~> boolean
  return o; // ok
}

// **UNSOUND**
// Because we support non-string props w/ bracket notation, it's possible to
// write into a declared prop unsoundly.
function unsound_string_conversion_alias_declared_prop(
  o: {[k:number]:any, "0":X},
) {
  o[0] = "not-x"; // a["0"] no longer X
}

function unification_dict_values_invariant(
  x: Array<{[k:string]:B}>,
) {
  let a: Array<{[k:string]:A}> = x; // error
  a[0].p = new A; // in[0].p no longer B

  let b: Array<{[k:string]:B}> = x; // ok

  let c: Array<{[k:string]:C}> = x; // error
  (x[0].p: C); // not true
}

function subtype_dict_values_invariant(
  x: {[k:string]:B},
) {
  let a: {[k:string]:A} = x; // error
  a.p = new A; // x[0].p no longer B

  let b: {[k:string]:B} = x; // ok

  let c: {[k:string]:C} = x; // error
  (x.p: C); // not true
}

function subtype_dict_values_fresh_exception() {
  let a: {[k:string]:A} = {
    a: new A, // ok, A == A
    b: new B, // ok, B <: A
    c: new C, // ok, C <: A
  };

  let b: {[k:string]:B} = {
    a: new A, // error, A not <: B
    b: new B, // ok, B == B
    c: new C, // ok, C <: A
  };

  let c: {[k:string]:C} = {
    a: new A, // error, A not <: C
    b: new B, // error, A not <: C
    c: new C, // ok, C == C
  };
}

// Actually, unsound_string_conversion_alias_declared_prop behavior makes an
// argument that we shouldn't really care about this, since we ignore the fact
// that coercing values to string keys can cause unintended aliasing in general.
// Barring some compelling use case for that in this context, though, we choose
// to be strict.
function unification_dict_keys_invariant(
  x: Array<{[k:B]:any}>,
) {
  let a: Array<{[k:A]:any}> = x; // error
  let b: Array<{[k:B]:any}> = x; // ok
  let c: Array<{[k:C]:any}> = x; // error
}

function subtype_dict_keys_invariant(
  x: {[k:B]:any},
) {
  let a: {[k:A]:any} = x; // error
  let b: {[k:B]:any} = x; // ok
  let c: {[k:C]:any} = x; // error
}

function unification_mix_with_declared_props_invariant_l(
  x: Array<{[k:string]:B}>,
) {
  let a: Array<{[k:string]:B, p:A}> = x; // error: A ~> B
  a[0].p = new A; // x[0].p no longer B

  let b: Array<{[k:string]:B, p:B}> = x; // ok

  let c: Array<{[k:string]:B, p:C}> = x; // error
  (x[0].p: C); // not true
}

function unification_mix_with_declared_props_invariant_r(
  xa: Array<{[k:string]:A, p:B}>,
  xb: Array<{[k:string]:B, p:B}>,
  xc: Array<{[k:string]:C, p:B}>,
) {
  let a: Array<{[k:string]:A}> = xa; // error
  a[0].p = new A; // xa[0].p no longer B

  let b: Array<{[k:string]:B}> = xb; // ok

  let c: Array<{[k:string]:C}> = xc; // error
  (xc[0].p: C); // not true
}

function subtype_mix_with_declared_props_invariant_l(
  x: {[k:string]:B},
) {
  let a: {[k:string]:B, p:A} = x; // error: A ~> B
  a.p = new A; // x.p no longer B

  let b: {[k:string]:B, p:B} = x; // ok

  let c: {[k:string]:B, p:C} = x; // error
  (x.p: C); // not true
}

function subtype_mix_with_declared_props_invariant_r(
  xa: {[k:string]:A, p:B},
  xb: {[k:string]:B, p:B},
  xc: {[k:string]:C, p:B},
) {
  let a: {[k:string]:A} = xa; // error
  a.p = new A; // xa.p no longer B

  let b: {[k:string]:B} = xb; // ok

  let c: {[k:string]:C} = xc; // error
  (xc.p: C); // not true
}

function unification_dict_to_obj(
  x: Array<{[k:string]:X}>,
): Array<{p:X}> {
  return x; // error: if allowed, could write {p:X,q:Y} into \`x\`
}

function unification_obj_to_dict(
  x: Array<{p:X}>,
): Array<{[k:string]:X}> {
  return x; // error: if allowed, could write {p:X,q:Y} into returned array
}

function subtype_dict_to_obj(
  x: {[k:string]:B},
) {
  let a: {p:A} = x; // error
  a.p = new A; // x.p no longer B

  let b: {p:B} = x; // ok

  let c: {p:C} = x; // error
  (x.p: C); // not true
}

function subtype_obj_to_dict(
  x: {p:B},
) {
  let a: {[k:string]:A} = x; // error
  a.p = new A; // x.p no longer B

  let b: {[k:string]:B} = x;

  let c: {[k:string]:C} = x; // error
  (x.p: C); // not true
}

// Only props in l which are not in u must match indexer, but must do so
// exactly.
function subtype_obj_to_mixed(
  x: {p:B, x:X},
) {
  let a: {[k:string]:A,x:X} = x; // error (as above), but exclusive of x
  let b: {[k:string]:B,x:X} = x; // ok,
  let c: {[k:string]:C,x:X} = x; // error (as above), but exclusive of x
}

function unification_dict_to_mixed(
  x: Array<{[k:string]:B}>,
) {
  let a: Array<{[k:string]:B, p:A}> = x; // error
  let b: Array<{[k:string]:B, p:B}> = x; // ok
  let c: Array<{[k:string]:B, p:C}> = x; // error
}

function subtype_dict_to_mixed(
  x: {[k:string]:B},
) {
  let a: {[k:string]:B, p:A} = x; // error
  let b: {[k:string]:B, p:B} = x; // ok
  let c: {[k:string]:B, p:C} = x; // error
}

function subtype_dict_to_optional_a(
  x: {[k:string]:B},
) {
  let a: {p?:A} = x; // error
}

function subtype_dict_to_optional_b(
  x: {[k:string]:B},
) {
  let b: {p?:B} = x; // ok
}

function subtype_dict_to_optional_c(
  x: {[k:string]:B},
) {
  let c: {p?:C} = x; // error
}

function subtype_optional_a_to_dict(
  x: {p?:A},
): {[k:string]:B} { // error: A ~> B
  return x;
}

function subtype_optional_b_to_dict(
  x: {p?:B},
): {[k:string]:B} { // ok
  return x;
}

function subtype_optional_c_to_dict(
  x: {p?:C},
): {[k:string]:B} { // error: C ~> B
  return x;
}

=====================================output=====================================
/* Dictionary types are object types that include an indexer, which specifies a
 * key type and a value type. The presence of an indexer makes the object type
 * unsealed, but all added properties must be consistent with the indexer
 * signature.
 *
 * Dictionaries can be used to represent the common idiom of objects used as
 * maps. They can also be used to represent array-like objects, e.g., NodeList
 * from the DOM API.
 *
 * A dictionary is assumed to have every property described by it's key type.
 * This behavior is similar to the behavior of arrays, which are assumed to have
 * a value at every index.
 *
 * @flow
 */

// Some logic is variance-sensitive.
class A {}
class B extends A {}
class C extends B {}

// Just a couple of short type names. Compare to string/number.
class X {}
class Y {}

// Any property can be set on a dict with string keys.
function set_prop_to_string_key(o: { [k: string]: any }) {
  o.prop = "ok";
}

// **UNSOUND**
// This is allowed by design. We don't track get/set and we don't wrap the
// return type in a maybe.
function unsound_dict_has_every_key(o: { [k: string]: X }) {
  (o.p: X); // ok
  (o["p"]: X); // ok
}

// As with any object type, we can assign subtypes to properties.
function set_prop_covariant(o: { [k: string]: B }) {
  o.p = new A(); // error, A ~> B
  o.p = new B(); // ok
  o.p = new C(); // ok
}

// This isn't specific behavior to dictionaries, but for completeness...
function get_prop_contravariant(o: { [k: string]: B }) {
  (o.p: A); // ok
  (o.p: B); // ok
  (o.p: C); // error, C ~> B
}

// Dot-notation can not be used to add properties to dictionaries with
// non-string keys, because keys are strings.
function add_prop_to_nonstring_key_dot(o: { [k: number]: any }) {
  o.prop = "err"; // error: string ~> number
}

// Bracket notation can be used to add properties to dictionaries with
// non-string keys, even though all keys are strings. This is a convenient
// affordance.
function add_prop_to_nonstring_key_bracket(o: { [k: number]: any }) {
  o[0] = "ok";
}

// Objects can be part dict, part not by mixing an indexer with declared props.
function mix_with_declared_props(o: { [k: number]: X, p: Y }, x: X, y: Y) {
  (o[0]: X); // ok
  (o.p: Y); // ok
  o[0] = x; // ok
  o.p = y; // ok
}

// Indeed, dict types are still Objects and have Object.prototype stuff
function object_prototype(o: {
  [k: string]: number
}): { [k: string]: number, +toString: () => string } {
  (o.toString(): boolean); // error: string ~> boolean
  return o; // ok
}

// **UNSOUND**
// Because we support non-string props w/ bracket notation, it's possible to
// write into a declared prop unsoundly.
function unsound_string_conversion_alias_declared_prop(o: {
  [k: number]: any,
  "0": X
}) {
  o[0] = "not-x"; // a["0"] no longer X
}

function unification_dict_values_invariant(x: Array<{ [k: string]: B }>) {
  let a: Array<{ [k: string]: A }> = x; // error
  a[0].p = new A(); // in[0].p no longer B

  let b: Array<{ [k: string]: B }> = x; // ok

  let c: Array<{ [k: string]: C }> = x; // error
  (x[0].p: C); // not true
}

function subtype_dict_values_invariant(x: { [k: string]: B }) {
  let a: { [k: string]: A } = x; // error
  a.p = new A(); // x[0].p no longer B

  let b: { [k: string]: B } = x; // ok

  let c: { [k: string]: C } = x; // error
  (x.p: C); // not true
}

function subtype_dict_values_fresh_exception() {
  let a: { [k: string]: A } = {
    a: new A(), // ok, A == A
    b: new B(), // ok, B <: A
    c: new C() // ok, C <: A
  };

  let b: { [k: string]: B } = {
    a: new A(), // error, A not <: B
    b: new B(), // ok, B == B
    c: new C() // ok, C <: A
  };

  let c: { [k: string]: C } = {
    a: new A(), // error, A not <: C
    b: new B(), // error, A not <: C
    c: new C() // ok, C == C
  };
}

// Actually, unsound_string_conversion_alias_declared_prop behavior makes an
// argument that we shouldn't really care about this, since we ignore the fact
// that coercing values to string keys can cause unintended aliasing in general.
// Barring some compelling use case for that in this context, though, we choose
// to be strict.
function unification_dict_keys_invariant(x: Array<{ [k: B]: any }>) {
  let a: Array<{ [k: A]: any }> = x; // error
  let b: Array<{ [k: B]: any }> = x; // ok
  let c: Array<{ [k: C]: any }> = x; // error
}

function subtype_dict_keys_invariant(x: { [k: B]: any }) {
  let a: { [k: A]: any } = x; // error
  let b: { [k: B]: any } = x; // ok
  let c: { [k: C]: any } = x; // error
}

function unification_mix_with_declared_props_invariant_l(
  x: Array<{ [k: string]: B }>
) {
  let a: Array<{ [k: string]: B, p: A }> = x; // error: A ~> B
  a[0].p = new A(); // x[0].p no longer B

  let b: Array<{ [k: string]: B, p: B }> = x; // ok

  let c: Array<{ [k: string]: B, p: C }> = x; // error
  (x[0].p: C); // not true
}

function unification_mix_with_declared_props_invariant_r(
  xa: Array<{ [k: string]: A, p: B }>,
  xb: Array<{ [k: string]: B, p: B }>,
  xc: Array<{ [k: string]: C, p: B }>
) {
  let a: Array<{ [k: string]: A }> = xa; // error
  a[0].p = new A(); // xa[0].p no longer B

  let b: Array<{ [k: string]: B }> = xb; // ok

  let c: Array<{ [k: string]: C }> = xc; // error
  (xc[0].p: C); // not true
}

function subtype_mix_with_declared_props_invariant_l(x: { [k: string]: B }) {
  let a: { [k: string]: B, p: A } = x; // error: A ~> B
  a.p = new A(); // x.p no longer B

  let b: { [k: string]: B, p: B } = x; // ok

  let c: { [k: string]: B, p: C } = x; // error
  (x.p: C); // not true
}

function subtype_mix_with_declared_props_invariant_r(
  xa: { [k: string]: A, p: B },
  xb: { [k: string]: B, p: B },
  xc: { [k: string]: C, p: B }
) {
  let a: { [k: string]: A } = xa; // error
  a.p = new A(); // xa.p no longer B

  let b: { [k: string]: B } = xb; // ok

  let c: { [k: string]: C } = xc; // error
  (xc.p: C); // not true
}

function unification_dict_to_obj(
  x: Array<{ [k: string]: X }>
): Array<{ p: X }> {
  return x; // error: if allowed, could write {p:X,q:Y} into \`x\`
}

function unification_obj_to_dict(
  x: Array<{ p: X }>
): Array<{ [k: string]: X }> {
  return x; // error: if allowed, could write {p:X,q:Y} into returned array
}

function subtype_dict_to_obj(x: { [k: string]: B }) {
  let a: { p: A } = x; // error
  a.p = new A(); // x.p no longer B

  let b: { p: B } = x; // ok

  let c: { p: C } = x; // error
  (x.p: C); // not true
}

function subtype_obj_to_dict(x: { p: B }) {
  let a: { [k: string]: A } = x; // error
  a.p = new A(); // x.p no longer B

  let b: { [k: string]: B } = x;

  let c: { [k: string]: C } = x; // error
  (x.p: C); // not true
}

// Only props in l which are not in u must match indexer, but must do so
// exactly.
function subtype_obj_to_mixed(x: { p: B, x: X }) {
  let a: { [k: string]: A, x: X } = x; // error (as above), but exclusive of x
  let b: { [k: string]: B, x: X } = x; // ok,
  let c: { [k: string]: C, x: X } = x; // error (as above), but exclusive of x
}

function unification_dict_to_mixed(x: Array<{ [k: string]: B }>) {
  let a: Array<{ [k: string]: B, p: A }> = x; // error
  let b: Array<{ [k: string]: B, p: B }> = x; // ok
  let c: Array<{ [k: string]: B, p: C }> = x; // error
}

function subtype_dict_to_mixed(x: { [k: string]: B }) {
  let a: { [k: string]: B, p: A } = x; // error
  let b: { [k: string]: B, p: B } = x; // ok
  let c: { [k: string]: B, p: C } = x; // error
}

function subtype_dict_to_optional_a(x: { [k: string]: B }) {
  let a: { p?: A } = x; // error
}

function subtype_dict_to_optional_b(x: { [k: string]: B }) {
  let b: { p?: B } = x; // ok
}

function subtype_dict_to_optional_c(x: { [k: string]: B }) {
  let c: { p?: C } = x; // error
}

function subtype_optional_a_to_dict(x: { p?: A }): { [k: string]: B } {
  // error: A ~> B
  return x;
}

function subtype_optional_b_to_dict(x: { p?: B }): { [k: string]: B } {
  // ok
  return x;
}

function subtype_optional_c_to_dict(x: { p?: C }): { [k: string]: B } {
  // error: C ~> B
  return x;
}

================================================================================
`;

exports[`incompatible.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
/* @flow */

var x : {[key: string]: string} = {};
var y : {[key: string]: number} = x; // 2 errors, number !~> string & vice versa
var z : {[key: number]: string} = x; // 2 errors, string !~> number & vice versa

var a : {[key: string]: ?string} = {};
var b : {[key: string]: string} = a; // 2 errors (null & undefined)
var c : {[key: string]: ?string} = b; // 2 errors, since c['x'] = null updates b

// 2 errors (number !~> string, string !~> number)
function foo0(x: Array<{[key: string]: number}>): Array<{[key: string]: string}> {
  return x;
}

// error, fooBar:string !~> number (x's dictionary)
function foo1(
  x: Array<{[key: string]: number}>
): Array<{[key: string]: number, fooBar: string}> {
  return x;
}

function foo2(
  x: Array<{[key: string]: mixed}>
): Array<{[key: string]: mixed, fooBar: string}> {
  x[0].fooBar = 123; // OK, since number ~> mixed (x elem's dictionary)
  return x; // error: mixed ~> string
}

// OK, since we assume dictionaries have every key
function foo3(x: {[key: string]: number}): {foo: number} {
  return x;
}

// error: foo can't exist in x
function foo4(x: {[key: string]: number}): {[key: string]: number, foo: string} {
  return x;
}

// error, some prop in x could be incompatible (covariance)
function foo5(x: Array<{[key: string]: number}>): Array<{foo: number}> {
  return x;
}

// error, some prop in return could be incompatible
function foo6(x: Array<{foo: number}>): Array<{[key: string]: number}> {
  return x;
}

function foo7(x: {bar: string, [key: string]: number}) {
  (x.bar: string);
}

function foo8(x: {[key: string]: number}) {
  (x.foo: string); // error
  (x.foo: number);
}

=====================================output=====================================
/* @flow */

var x: { [key: string]: string } = {};
var y: { [key: string]: number } = x; // 2 errors, number !~> string & vice versa
var z: { [key: number]: string } = x; // 2 errors, string !~> number & vice versa

var a: { [key: string]: ?string } = {};
var b: { [key: string]: string } = a; // 2 errors (null & undefined)
var c: { [key: string]: ?string } = b; // 2 errors, since c['x'] = null updates b

// 2 errors (number !~> string, string !~> number)
function foo0(
  x: Array<{ [key: string]: number }>
): Array<{ [key: string]: string }> {
  return x;
}

// error, fooBar:string !~> number (x's dictionary)
function foo1(
  x: Array<{ [key: string]: number }>
): Array<{ [key: string]: number, fooBar: string }> {
  return x;
}

function foo2(
  x: Array<{ [key: string]: mixed }>
): Array<{ [key: string]: mixed, fooBar: string }> {
  x[0].fooBar = 123; // OK, since number ~> mixed (x elem's dictionary)
  return x; // error: mixed ~> string
}

// OK, since we assume dictionaries have every key
function foo3(x: { [key: string]: number }): { foo: number } {
  return x;
}

// error: foo can't exist in x
function foo4(x: {
  [key: string]: number
}): { [key: string]: number, foo: string } {
  return x;
}

// error, some prop in x could be incompatible (covariance)
function foo5(x: Array<{ [key: string]: number }>): Array<{ foo: number }> {
  return x;
}

// error, some prop in return could be incompatible
function foo6(x: Array<{ foo: number }>): Array<{ [key: string]: number }> {
  return x;
}

function foo7(x: { bar: string, [key: string]: number }) {
  (x.bar: string);
}

function foo8(x: { [key: string]: number }) {
  (x.foo: string); // error
  (x.foo: number);
}

================================================================================
`;

exports[`issue-1745.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
/* @flow */

class A {
  x: {[k:string]: number};

  m1() {
    this.x = { bar: 0 }; // no error
  }

  m2() {
    this.x.foo = 0; // no error
  }
}

class B {
  x: {[k:string]: number};

  m2() {
    this.x.foo = 0; // no error
  }

  m1() {
    this.x = { bar: 0 }; // no error
  }
}

=====================================output=====================================
/* @flow */

class A {
  x: { [k: string]: number };

  m1() {
    this.x = { bar: 0 }; // no error
  }

  m2() {
    this.x.foo = 0; // no error
  }
}

class B {
  x: { [k: string]: number };

  m2() {
    this.x.foo = 0; // no error
  }

  m1() {
    this.x = { bar: 0 }; // no error
  }
}

================================================================================
`;

exports[`test.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
type Params = {count: number; [name: string]: string};
type QueryFunction = (params: Params) => string;

var o: { foo: QueryFunction } = {
  foo(params) {
    return params.count; // error, number ~/~ string
  }
};

module.exports = o;

=====================================output=====================================
type Params = { count: number, [name: string]: string };
type QueryFunction = (params: Params) => string;

var o: { foo: QueryFunction } = {
  foo(params) {
    return params.count; // error, number ~/~ string
  }
};

module.exports = o;

================================================================================
`;

exports[`test_client.js 1`] = `
====================================options=====================================
parsers: ["flow", "babel"]
printWidth: 80
                                                                                | printWidth
=====================================input======================================
var o = require('./test');

o.foo = function (params) {
  return params.count; // error, number ~/~ string
}

=====================================output=====================================
var o = require("./test");

o.foo = function(params) {
  return params.count; // error, number ~/~ string
};

================================================================================
`;