fix missing generic attrs for svg · typed-ember/glint@045944f

'_oldSnapshot' is defined but never used

'msg' is assigned a value but never used. Allowed unused vars must match /^_/u

'SourceScript' is defined but never used. Allowed unused vars must match /^_/u

'getTsPluginClient' is defined but never used

'ts' is defined but never used

'directivesWeakMap' is defined but never used

'directivesWeakMap' is defined but never used

'Directive' is defined but never used. Allowed unused vars must match /^_/u

'options' is defined but never used

'ts' is defined but never used

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