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justingrantjustingrant
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Change ''.concat(value) to String(value)
`''.concat(value)` violates current Flow definitons that require args to concat to be strings only, even though the MDN docs and ES spec allow args to be any type. See facebook/flow#8728. To avoid depending on a change to Flow, this commit changes `''.concat(value)` to `String(value)` and removes the lint rule that prohibits use of String(value). This rule was added in facebook#9082. The other rules in that PR (for Boolean and Number constructors) are not changed in this commit, only the rule for String. If it's decided that using `concat` is better, simply omit this commit and use the previous one instead.
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‎fixtures/dom/src/components/fixtures/error-handling/index.js

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -41,7 +41,7 @@ class ErrorBoundary extends React.Component {
4141
if (this.state.error) {
4242
return <p>Captured an error: {this.state.error.message}</p>;
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} else {
44-
return <p>Captured an error: {''.concat(this.state.error)}</p>;
44+
return <p>Captured an error: {String(this.state.error)}</p>;
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}
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}
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if (this.state.shouldThrow) {

‎fixtures/legacy-jsx-runtimes/react-14/cjs/react-jsx-dev-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -104,7 +104,7 @@ function printWarning(level, format, args) {
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}
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var argsWithFormat = args.map(function (item) {
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return ''.concat(item);
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return String(item);
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}); // Careful: RN currently depends on this prefix
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argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -483,11 +483,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
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// key is explicitly declared to be undefined or not.
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485485
if (maybeKey !== undefined) {
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key = ''.concat(maybeKey);
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key = String(maybeKey);
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}
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if (hasValidKey(config)) {
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key = ''.concat(config.key);
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key = String(config.key);
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}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-14/cjs/react-jsx-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -103,7 +103,7 @@ function printWarning(level, format, args) {
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}
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var argsWithFormat = args.map(function (item) {
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return ''.concat(item);
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return String(item);
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}); // Careful: RN currently depends on this prefix
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argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -487,11 +487,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
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// key is explicitly declared to be undefined or not.
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if (maybeKey !== undefined) {
490-
key = ''.concat(maybeKey);
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key = String(maybeKey);
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}
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if (hasValidKey(config)) {
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key = ''.concat(config.key);
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key = String(config.key);
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}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-15/cjs/react-jsx-dev-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -109,7 +109,7 @@ function printWarning(level, format, args) {
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}
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var argsWithFormat = args.map(function (item) {
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return ''.concat(item);
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return String(item);
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}); // Careful: RN currently depends on this prefix
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argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -488,11 +488,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
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// key is explicitly declared to be undefined or not.
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if (maybeKey !== undefined) {
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key = ''.concat(maybeKey);
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key = String(maybeKey);
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}
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if (hasValidKey(config)) {
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key = ''.concat(config.key);
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key = String(config.key);
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}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-15/cjs/react-jsx-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -108,7 +108,7 @@ function printWarning(level, format, args) {
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}
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var argsWithFormat = args.map(function (item) {
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return ''.concat(item);
111+
return String(item);
112112
}); // Careful: RN currently depends on this prefix
113113

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argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -492,11 +492,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
492492
// key is explicitly declared to be undefined or not.
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if (maybeKey !== undefined) {
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key = ''.concat(maybeKey);
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key = String(maybeKey);
496496
}
497497

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if (hasValidKey(config)) {
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key = ''.concat(config.key);
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key = String(config.key);
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}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-16/cjs/react-jsx-dev-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -115,7 +115,7 @@ function printWarning(level, format, args) {
115115
}
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117117
var argsWithFormat = args.map(function (item) {
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return ''.concat(item);
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return String(item);
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}); // Careful: RN currently depends on this prefix
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argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -509,11 +509,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
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// key is explicitly declared to be undefined or not.
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if (maybeKey !== undefined) {
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key = ''.concat(maybeKey);
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key = String(maybeKey);
513513
}
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if (hasValidKey(config)) {
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key = ''.concat(config.key);
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key = String(config.key);
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}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-16/cjs/react-jsx-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -114,7 +114,7 @@ function printWarning(level, format, args) {
114114
}
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var argsWithFormat = args.map(function (item) {
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return ''.concat(item);
117+
return String(item);
118118
}); // Careful: RN currently depends on this prefix
119119

120120
argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -513,11 +513,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
513513
// key is explicitly declared to be undefined or not.
514514

515515
if (maybeKey !== undefined) {
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key = ''.concat(maybeKey);
516+
key = String(maybeKey);
517517
}
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if (hasValidKey(config)) {
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key = ''.concat(config.key);
520+
key = String(config.key);
521521
}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-17/cjs/react-jsx-dev-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -107,7 +107,7 @@ function printWarning(level, format, args) {
107107
}
108108

109109
var argsWithFormat = args.map(function (item) {
110-
return ''.concat(item);
110+
return String(item);
111111
}); // Careful: RN currently depends on this prefix
112112

113113
argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -815,11 +815,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
815815
// key is explicitly declared to be undefined or not.
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if (maybeKey !== undefined) {
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key = ''.concat(maybeKey);
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key = String(maybeKey);
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}
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if (hasValidKey(config)) {
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key = ''.concat(config.key);
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key = String(config.key);
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}
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if (hasValidRef(config)) {

‎fixtures/legacy-jsx-runtimes/react-17/cjs/react-jsx-runtime.development.js

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -107,7 +107,7 @@ function printWarning(level, format, args) {
107107
}
108108

109109
var argsWithFormat = args.map(function (item) {
110-
return ''.concat(item);
110+
return String(item);
111111
}); // Careful: RN currently depends on this prefix
112112

113113
argsWithFormat.unshift('Warning: ' + format); // We intentionally don't use spread (or .apply) directly because it
@@ -815,11 +815,11 @@ function jsxDEV(type, config, maybeKey, source, self) {
815815
// key is explicitly declared to be undefined or not.
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if (maybeKey !== undefined) {
818-
key = ''.concat(maybeKey);
818+
key = String(maybeKey);
819819
}
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821821
if (hasValidKey(config)) {
822-
key = ''.concat(config.key);
822+
key = String(config.key);
823823
}
824824

825825
if (hasValidRef(config)) {

‎packages/react-devtools-extensions/src/main.js

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -82,7 +82,7 @@ function createPanelIfReactLoaded() {
8282

8383
function initBridgeAndStore() {
8484
const port = chrome.runtime.connect({
85-
name: ''.concat(tabId),
85+
name: String(tabId),
8686
});
8787
// Looks like `port.onDisconnect` does not trigger on in-tab navigation like new URL or back/forward navigation,
8888
// so it makes no sense to handle it here.

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