no-unused-keys false negative with `.` in key

[wolfgangwalther]

Reproduced with the unit tests in this repo, simply add a dot to one of the keys in tests/lib/rules/no-unused-keys.ts.

diff --git a/tests/lib/rules/no-unused-keys.ts b/tests/lib/rules/no-unused-keys.ts
index b923ba8..cf550b8 100644
--- a/tests/lib/rules/no-unused-keys.ts
+++ b/tests/lib/rules/no-unused-keys.ts
@@ -25,7 +25,7 @@ new RuleTester({
         "link": "@:messages.hello"
       },
       "hello_dio": "hello underscore DIO!",
-      "hello {name}": "hello {name}!"
+      "hello {name}.": "hello {name}!"
     }
     </i18n>
     <template>
@@ -36,7 +36,7 @@ new RuleTester({
     <script>
     export default {
       created () {
-        this.$i18n.t('hello {name}', { name: 'DIO' })
+        this.$i18n.t('hello {name}.', { name: 'DIO' })
         this.$t('hello')
       }
     }

This will now yield:

  398 passing (1s)
  1 failing

  1) no-unused-keys
       valid

    <i18n locale="en">
    {
      "hello": "hello world",
      "messages": {
        "hello": "hi DIO!",
        "link": "@:messages.hello"
      },
      "hello_dio": "hello underscore DIO!",
      "hello {name}.": "hello {name}!"
    }
    </i18n>
    <template>
      <div id="app">
        <p v-t="'hello_dio'">{{ $t('messages.link') }}</p>
      </div>
    </template>
    <script>
    export default {
      created () {
        this.$i18n.t('hello {name}.', { name: 'DIO' })
        this.$t('hello')
      }
    }
    </script>:

      AssertionError [ERR_ASSERTION]: Should have no errors but had 1: [
  {
    ruleId: 'no-unused-keys',
    severity: 1,
    message: `unused '["hello {name}."]' key`,
    line: 10,
    column: 7,
    nodeType: null,
    endLine: 10,
    endColumn: 22,
    suggestions: [ [Object] ]
  }
]
      + expected - actual

      -1
      +0

      at testValidTemplate (node_modules/eslint/lib/rule-tester/rule-tester.js:697:20)
      at Context.<anonymous> (node_modules/eslint/lib/rule-tester/rule-tester.js:972:29)
      at processImmediate (node:internal/timers:464:21)

i.e. hello {name}. is reported as unused, even though it's not.

[ota-meshi]

Thank you for posting this issue!
Probably fix by #256.

[wolfgangwalther]

Just realized the no-missing-keys rule has exactly the same problem with keys ending on a .. This results in a false positive.