Prevent invalid characters from appearing in markup (react/no-unescaped-entities)

[feross]

https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-unescaped-entities.md

---

From my testing, the configuration with no false positives is:

    "react/no-unescaped-entities": ["error", {
      "forbid": [">", "}"]
    }],

---

This rule prevents characters that you may have meant as JSX escape characters
from being accidentally injected as a text node in JSX statements.

For example, if one were to misplace their closing > in a tag:

<MyComponent
  name="name"
  type="string"
  foo="bar">  {/* oops! */}
  x="y">
  Body Text
</MyComponent>

The body text of this would render as x="y"> Body Text, which is probably not
what was intended. This rule requires that these special characters are
escaped if they appear in the body of a tag.

Another example is when one accidentally includes an extra closing brace.

<MyComponent>{'Text'}}</MyComponent>

The extra brace will be rendered, and the body text will be Text}.

This rule will also check for " and ', which might be accidentally included
when the closing > is in the wrong place.

<MyComponent
  a="b">  {/* oops! */}
  c="d"
  Intended body text
</MyComponent>

The preferred way to include one of these characters is to use the HTML escape code.

• > can be replaced with >
• " can be replaced with ", “, " or ”
• ' can be replaced with ', ‘, ' or ’
• } can be replaced with }

Alternatively, you can include the literal character inside a subexpression
(such as <div>{'>'}</div>.

The characters < and { should also be escaped, but they are not checked by this
rule because it is a syntax error to include those tokens inside of a tag.

Rule Details

Examples of incorrect code for this rule:

<div> > </div>

Examples of correct code for this rule:

<div> &gt; </div>

<div> {'>'} </div>

Rule Options

...
"react/no-unescaped-entities": [<enabled>, { "forbid": Array<string> }]
...

forbid

Overwrite the default forbidden entities array ['>', '"', '\'', '}'] with your own:

"react/no-unescaped-entities": ["error", {"forbid": [">", "}"]}],
// or
"react/no-unescaped-entities": ["error", {"forbid": [{
  char: ">",
  alternatives: ['>']
}, {
  char: "}",
  alternatives: ['}']
}]}],

Where char is a special character and alternatives is the correct escapes.